Update llvm/clang to trunk r126547.

There are several bugfixes in this update, but the most important one is
to ensure __start_ and __stop_ symbols for linker sets and kernel module
metadata are always emitted in object files:

  http://llvm.org/bugs/show_bug.cgi?id=9292

Before this fix, if you compiled kernel modules with clang, they would
not be properly processed by kldxref, and if they had any dependencies,
the kernel would fail to load those.  Another problem occurred when
attempting to mount a tmpfs filesystem, which would result in 'operation
not supported by device'.

1 files changed, 30 insertions, 22 deletions

diff --git a/contrib/llvm/tools/clang/lib/Sema/SemaExprCXX.cpp b/contrib/llvm/tools/clang/lib/Sema/SemaExprCXX.cpp
index f9c2c9a..6dd7aab 100644
--- a/contrib/llvm/tools/clang/lib/Sema/SemaExprCXX.cpp
+++ b/contrib/llvm/tools/clang/lib/Sema/SemaExprCXX.cpp
@@ -107,7 +107,7 @@ ParsedType Sema::getDestructorName(SourceLocation TildeLoc,
       // Nothing left to do.
     } else if (LookAtPrefix && (Prefix = NNS->getPrefix())) {
       CXXScopeSpec PrefixSS;
-      PrefixSS.setScopeRep(Prefix);
+      PrefixSS.Adopt(NestedNameSpecifierLoc(Prefix, SS.location_data()));
       LookupCtx = computeDeclContext(PrefixSS, EnteringContext);
       isDependent = isDependentScopeSpecifier(PrefixSS);
     } else if (ObjectTypePtr) {
@@ -476,7 +476,9 @@ Sema::ActOnCXXNullPtrLiteral(SourceLocation Loc) {
 /// ActOnCXXThrow - Parse throw expressions.
 ExprResult
 Sema::ActOnCXXThrow(SourceLocation OpLoc, Expr *Ex) {
-  if (!getLangOptions().Exceptions)
+  // Don't report an error if 'throw' is used in system headers.
+  if (!getLangOptions().Exceptions &&
+      !getSourceManager().isInSystemHeader(OpLoc))
     Diag(OpLoc, diag::err_exceptions_disabled) << "throw";
 
   if (Ex && !Ex->isTypeDependent() && CheckCXXThrowOperand(OpLoc, Ex))
@@ -1347,6 +1349,7 @@ bool Sema::FindAllocationOverload(SourceLocation StartLoc, SourceRange Range,
   case OR_Success: {
     // Got one!
     FunctionDecl *FnDecl = Best->Function;
+    MarkDeclarationReferenced(StartLoc, FnDecl);
     // The first argument is size_t, and the first parameter must be size_t,
     // too. This is checked on declaration and can be assumed. (It can't be
     // asserted on, though, since invalid decls are left in there.)
@@ -1384,7 +1387,10 @@ bool Sema::FindAllocationOverload(SourceLocation StartLoc, SourceRange Range,
   case OR_Deleted:
     Diag(StartLoc, diag::err_ovl_deleted_call)
       << Best->Function->isDeleted()
-      << Name << Range;
+      << Name 
+      << Best->Function->getMessageUnavailableAttr(
+             !Best->Function->isDeleted())
+      << Range;
     Candidates.NoteCandidates(*this, OCD_AllCandidates, Args, NumArgs);
     return true;
   }
@@ -2920,6 +2926,8 @@ static bool FindConditionalOverload(Sema &Self, Expr *&LHS, Expr *&RHS,
           Self.PerformImplicitConversion(RHS, Best->BuiltinTypes.ParamTypes[1],
                                          Best->Conversions[1], Sema::AA_Converting))
         break;
+      if (Best->Function)
+        Self.MarkDeclarationReferenced(QuestionLoc, Best->Function);
       return false;
 
     case OR_No_Viable_Function:
@@ -3580,14 +3588,14 @@ ExprResult Sema::DiagnoseDtorReference(SourceLocation NameLoc,
 }
 
 ExprResult Sema::BuildPseudoDestructorExpr(Expr *Base,
-                                                       SourceLocation OpLoc,
-                                                       tok::TokenKind OpKind,
-                                                       const CXXScopeSpec &SS,
-                                                 TypeSourceInfo *ScopeTypeInfo,
-                                                       SourceLocation CCLoc,
-                                                       SourceLocation TildeLoc,
+                                           SourceLocation OpLoc,
+                                           tok::TokenKind OpKind,
+                                           const CXXScopeSpec &SS,
+                                           TypeSourceInfo *ScopeTypeInfo,
+                                           SourceLocation CCLoc,
+                                           SourceLocation TildeLoc,
                                          PseudoDestructorTypeStorage Destructed,
-                                                       bool HasTrailingLParen) {
+                                           bool HasTrailingLParen) {
   TypeSourceInfo *DestructedTypeInfo = Destructed.getTypeSourceInfo();
 
   // C++ [expr.pseudo]p2:
@@ -3662,7 +3670,7 @@ ExprResult Sema::BuildPseudoDestructorExpr(Expr *Base,
   Expr *Result
     = new (Context) CXXPseudoDestructorExpr(Context, Base,
                                             OpKind == tok::arrow, OpLoc,
-                                            SS.getScopeRep(), SS.getRange(),
+                                            SS.getWithLocInContext(Context),
                                             ScopeTypeInfo,
                                             CCLoc,
                                             TildeLoc,
@@ -3675,14 +3683,14 @@ ExprResult Sema::BuildPseudoDestructorExpr(Expr *Base,
 }
 
 ExprResult Sema::ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
-                                                       SourceLocation OpLoc,
-                                                       tok::TokenKind OpKind,
-                                                       CXXScopeSpec &SS,
-                                                  UnqualifiedId &FirstTypeName,
-                                                       SourceLocation CCLoc,
-                                                       SourceLocation TildeLoc,
-                                                 UnqualifiedId &SecondTypeName,
-                                                       bool HasTrailingLParen) {
+                                           SourceLocation OpLoc,
+                                           tok::TokenKind OpKind,
+                                           CXXScopeSpec &SS,
+                                           UnqualifiedId &FirstTypeName,
+                                           SourceLocation CCLoc,
+                                           SourceLocation TildeLoc,
+                                           UnqualifiedId &SecondTypeName,
+                                           bool HasTrailingLParen) {
   assert((FirstTypeName.getKind() == UnqualifiedId::IK_TemplateId ||
           FirstTypeName.getKind() == UnqualifiedId::IK_Identifier) &&
          "Invalid first type name in pseudo-destructor");
@@ -3714,8 +3722,8 @@ ExprResult Sema::ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
   // record types and dependent types matter.
   ParsedType ObjectTypePtrForLookup;
   if (!SS.isSet()) {
-    if (const Type *T = ObjectType->getAs<RecordType>())
-      ObjectTypePtrForLookup = ParsedType::make(QualType(T, 0));
+    if (ObjectType->isRecordType())
+      ObjectTypePtrForLookup = ParsedType::make(ObjectType);
     else if (ObjectType->isDependentType())
       ObjectTypePtrForLookup = ParsedType::make(Context.DependentTy);
   }
@@ -3784,7 +3792,7 @@ ExprResult Sema::ActOnPseudoDestructorExpr(Scope *S, Expr *Base,
     if (FirstTypeName.getKind() == UnqualifiedId::IK_Identifier) {
       ParsedType T = getTypeName(*FirstTypeName.Identifier,
                                  FirstTypeName.StartLocation,
-                                 S, &SS, false, false, ObjectTypePtrForLookup);
+                                 S, &SS, true, false, ObjectTypePtrForLookup);
       if (!T) {
         Diag(FirstTypeName.StartLocation,
              diag::err_pseudo_dtor_destructor_non_type)