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diff --git a/contrib/llvm/lib/IR/LLVMContextImpl.cpp b/contrib/llvm/lib/IR/LLVMContextImpl.cpp
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+++ b/contrib/llvm/lib/IR/LLVMContextImpl.cpp
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+//===-- LLVMContextImpl.cpp - Implement LLVMContextImpl -------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file implements the opaque LLVMContextImpl.
+//
+//===----------------------------------------------------------------------===//
+
+#include "LLVMContextImpl.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/IR/Attributes.h"
+#include "llvm/IR/DiagnosticInfo.h"
+#include "llvm/IR/Module.h"
+#include <algorithm>
+using namespace llvm;
+
+LLVMContextImpl::LLVMContextImpl(LLVMContext &C)
+  : TheTrueVal(nullptr), TheFalseVal(nullptr),
+    VoidTy(C, Type::VoidTyID),
+    LabelTy(C, Type::LabelTyID),
+    HalfTy(C, Type::HalfTyID),
+    FloatTy(C, Type::FloatTyID),
+    DoubleTy(C, Type::DoubleTyID),
+    MetadataTy(C, Type::MetadataTyID),
+    X86_FP80Ty(C, Type::X86_FP80TyID),
+    FP128Ty(C, Type::FP128TyID),
+    PPC_FP128Ty(C, Type::PPC_FP128TyID),
+    X86_MMXTy(C, Type::X86_MMXTyID),
+    Int1Ty(C, 1),
+    Int8Ty(C, 8),
+    Int16Ty(C, 16),
+    Int32Ty(C, 32),
+    Int64Ty(C, 64),
+    Int128Ty(C, 128) {
+  InlineAsmDiagHandler = nullptr;
+  InlineAsmDiagContext = nullptr;
+  DiagnosticHandler = nullptr;
+  DiagnosticContext = nullptr;
+  RespectDiagnosticFilters = false;
+  YieldCallback = nullptr;
+  YieldOpaqueHandle = nullptr;
+  NamedStructTypesUniqueID = 0;
+}
+
+namespace {
+struct DropReferences {
+  // Takes the value_type of a ConstantUniqueMap's internal map, whose 'second'
+  // is a Constant*.
+  template <typename PairT> void operator()(const PairT &P) {
+    P.second->dropAllReferences();
+  }
+};
+
+// Temporary - drops pair.first instead of second.
+struct DropFirst {
+  // Takes the value_type of a ConstantUniqueMap's internal map, whose 'second'
+  // is a Constant*.
+  template<typename PairT>
+  void operator()(const PairT &P) {
+    P.first->dropAllReferences();
+  }
+};
+} // namespace
+
+LLVMContextImpl::~LLVMContextImpl() {
+  // NOTE: We need to delete the contents of OwnedModules, but Module's dtor
+  // will call LLVMContextImpl::removeModule, thus invalidating iterators into
+  // the container. Avoid iterators during this operation:
+  while (!OwnedModules.empty())
+    delete *OwnedModules.begin();
+
+  // Drop references for MDNodes.  Do this before Values get deleted to avoid
+  // unnecessary RAUW when nodes are still unresolved.
+  for (auto *I : DistinctMDNodes)
+    I->dropAllReferences();
+#define HANDLE_MDNODE_LEAF(CLASS)                                              \
+  for (auto *I : CLASS##s)                                                     \
+    I->dropAllReferences();
+#include "llvm/IR/Metadata.def"
+
+  // Also drop references that come from the Value bridges.
+  for (auto &Pair : ValuesAsMetadata)
+    Pair.second->dropUsers();
+  for (auto &Pair : MetadataAsValues)
+    Pair.second->dropUse();
+
+  // Destroy MDNodes.
+  for (MDNode *I : DistinctMDNodes)
+    I->deleteAsSubclass();
+#define HANDLE_MDNODE_LEAF(CLASS)                                              \
+  for (CLASS *I : CLASS##s)                                                    \
+    delete I;
+#include "llvm/IR/Metadata.def"
+
+  // Free the constants.
+  std::for_each(ExprConstants.map_begin(), ExprConstants.map_end(),
+                DropFirst());
+  std::for_each(ArrayConstants.map_begin(), ArrayConstants.map_end(),
+                DropFirst());
+  std::for_each(StructConstants.map_begin(), StructConstants.map_end(),
+                DropFirst());
+  std::for_each(VectorConstants.map_begin(), VectorConstants.map_end(),
+                DropFirst());
+  ExprConstants.freeConstants();
+  ArrayConstants.freeConstants();
+  StructConstants.freeConstants();
+  VectorConstants.freeConstants();
+  DeleteContainerSeconds(CAZConstants);
+  DeleteContainerSeconds(CPNConstants);
+  DeleteContainerSeconds(UVConstants);
+  InlineAsms.freeConstants();
+  DeleteContainerSeconds(IntConstants);
+  DeleteContainerSeconds(FPConstants);
+  
+  for (StringMap<ConstantDataSequential*>::iterator I = CDSConstants.begin(),
+       E = CDSConstants.end(); I != E; ++I)
+    delete I->second;
+  CDSConstants.clear();
+
+  // Destroy attributes.
+  for (FoldingSetIterator<AttributeImpl> I = AttrsSet.begin(),
+         E = AttrsSet.end(); I != E; ) {
+    FoldingSetIterator<AttributeImpl> Elem = I++;
+    delete &*Elem;
+  }
+
+  // Destroy attribute lists.
+  for (FoldingSetIterator<AttributeSetImpl> I = AttrsLists.begin(),
+         E = AttrsLists.end(); I != E; ) {
+    FoldingSetIterator<AttributeSetImpl> Elem = I++;
+    delete &*Elem;
+  }
+
+  // Destroy attribute node lists.
+  for (FoldingSetIterator<AttributeSetNode> I = AttrsSetNodes.begin(),
+         E = AttrsSetNodes.end(); I != E; ) {
+    FoldingSetIterator<AttributeSetNode> Elem = I++;
+    delete &*Elem;
+  }
+
+  // Destroy MetadataAsValues.
+  {
+    SmallVector<MetadataAsValue *, 8> MDVs;
+    MDVs.reserve(MetadataAsValues.size());
+    for (auto &Pair : MetadataAsValues)
+      MDVs.push_back(Pair.second);
+    MetadataAsValues.clear();
+    for (auto *V : MDVs)
+      delete V;
+  }
+
+  // Destroy ValuesAsMetadata.
+  for (auto &Pair : ValuesAsMetadata)
+    delete Pair.second;
+
+  // Destroy MDStrings.
+  MDStringCache.clear();
+}
+
+void LLVMContextImpl::dropTriviallyDeadConstantArrays() {
+  bool Changed;
+  do {
+    Changed = false;
+
+    for (auto I = ArrayConstants.map_begin(), E = ArrayConstants.map_end();
+         I != E; ) {
+      auto *C = I->first;
+      I++;
+      if (C->use_empty()) {
+        Changed = true;
+        C->destroyConstant();
+      }
+    }
+
+  } while (Changed);
+}
+
+void Module::dropTriviallyDeadConstantArrays() {
+  Context.pImpl->dropTriviallyDeadConstantArrays();
+}
+
+namespace llvm {
+/// \brief Make MDOperand transparent for hashing.
+///
+/// This overload of an implementation detail of the hashing library makes
+/// MDOperand hash to the same value as a \a Metadata pointer.
+///
+/// Note that overloading \a hash_value() as follows:
+///
+/// \code
+///     size_t hash_value(const MDOperand &X) { return hash_value(X.get()); }
+/// \endcode
+///
+/// does not cause MDOperand to be transparent.  In particular, a bare pointer
+/// doesn't get hashed before it's combined, whereas \a MDOperand would.
+static const Metadata *get_hashable_data(const MDOperand &X) { return X.get(); }
+} // namespace llvm
+
+unsigned MDNodeOpsKey::calculateHash(MDNode *N, unsigned Offset) {
+  unsigned Hash = hash_combine_range(N->op_begin() + Offset, N->op_end());
+#ifndef NDEBUG
+  {
+    SmallVector<Metadata *, 8> MDs(N->op_begin() + Offset, N->op_end());
+    unsigned RawHash = calculateHash(MDs);
+    assert(Hash == RawHash &&
+           "Expected hash of MDOperand to equal hash of Metadata*");
+  }
+#endif
+  return Hash;
+}
+
+unsigned MDNodeOpsKey::calculateHash(ArrayRef<Metadata *> Ops) {
+  return hash_combine_range(Ops.begin(), Ops.end());
+}
+
+// ConstantsContext anchors
+void UnaryConstantExpr::anchor() { }
+
+void BinaryConstantExpr::anchor() { }
+
+void SelectConstantExpr::anchor() { }
+
+void ExtractElementConstantExpr::anchor() { }
+
+void InsertElementConstantExpr::anchor() { }
+
+void ShuffleVectorConstantExpr::anchor() { }
+
+void ExtractValueConstantExpr::anchor() { }
+
+void InsertValueConstantExpr::anchor() { }
+
+void GetElementPtrConstantExpr::anchor() { }
+
+void CompareConstantExpr::anchor() { }
+