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, 9 insertions, 2 deletions

diff --git a/contrib/llvm/tools/clang/lib/CodeGen/TargetInfo.cpp b/contrib/llvm/tools/clang/lib/CodeGen/TargetInfo.cpp
index d74b3f3..2ffc840 100644
--- a/contrib/llvm/tools/clang/lib/CodeGen/TargetInfo.cpp
+++ b/contrib/llvm/tools/clang/lib/CodeGen/TargetInfo.cpp
@@ -2105,8 +2105,15 @@ ABIArgInfo WinX86_64ABIInfo::classify(QualType Ty) const {
         RT->getDecl()->hasFlexibleArrayMember())
       return ABIArgInfo::getIndirect(0, /*ByVal=*/false);
 
-    // FIXME: mingw64-gcc emits 128-bit struct as i128
-    if (Size <= 128 &&
+    // FIXME: mingw-w64-gcc emits 128-bit struct as i128
+    if (Size == 128 &&
+        getContext().Target.getTriple().getOS() == llvm::Triple::MinGW32)
+      return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(),
+                                                          Size));
+
+    // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is
+    // not 1, 2, 4, or 8 bytes, must be passed by reference."
+    if (Size <= 64 &&
         (Size & (Size - 1)) == 0)
       return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(),
                                                           Size));