Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/Support/ARMBuildAttributes.h b/linux-x64/clang/include/llvm/Support/ARMBuildAttributes.h
index 6c83e44..b8a0376 100644
--- a/linux-x64/clang/include/llvm/Support/ARMBuildAttributes.h
+++ b/linux-x64/clang/include/llvm/Support/ARMBuildAttributes.h
@@ -213,6 +213,8 @@
   // Tag_ABI_VFP_args, (=28), uleb128
   BaseAAPCS = 0,
   HardFPAAPCS = 1,
+  ToolChainFPPCS = 2,
+  CompatibleFPAAPCS = 3,
 
   // Tag_FP_HP_extension, (=36), uleb128
   AllowHPFP = 1, // Allow use of Half Precision FP