Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/IR/CallingConv.h b/linux-x64/clang/include/llvm/IR/CallingConv.h
index 84fe836..b9c02d7 100644
--- a/linux-x64/clang/include/llvm/IR/CallingConv.h
+++ b/linux-x64/clang/include/llvm/IR/CallingConv.h
@@ -26,7 +26,7 @@
 
   /// A set of enums which specify the assigned numeric values for known llvm
   /// calling conventions.
-  /// @brief LLVM Calling Convention Representation
+  /// LLVM Calling Convention Representation
   enum {
     /// C - The default llvm calling convention, compatible with C.  This
     /// convention is the only calling convention that supports varargs calls.
@@ -139,11 +139,11 @@
     /// Intel_OCL_BI - Calling conventions for Intel OpenCL built-ins
     Intel_OCL_BI = 77,
 
-    /// \brief The C convention as specified in the x86-64 supplement to the
+    /// The C convention as specified in the x86-64 supplement to the
     /// System V ABI, used on most non-Windows systems.
     X86_64_SysV = 78,
 
-    /// \brief The C convention as implemented on Windows/x86-64 and
+    /// The C convention as implemented on Windows/x86-64 and
     /// AArch64. This convention differs from the more common
     /// \c X86_64_SysV convention in a number of ways, most notably in
     /// that XMM registers used to pass arguments are shadowed by GPRs,
@@ -153,17 +153,17 @@
     /// registers to variadic functions.
     Win64 = 79,
 
-    /// \brief MSVC calling convention that passes vectors and vector aggregates
+    /// MSVC calling convention that passes vectors and vector aggregates
     /// in SSE registers.
     X86_VectorCall = 80,
 
-    /// \brief Calling convention used by HipHop Virtual Machine (HHVM) to
+    /// Calling convention used by HipHop Virtual Machine (HHVM) to
     /// perform calls to and from translation cache, and for calling PHP
     /// functions.
     /// HHVM calling convention supports tail/sibling call elimination.
     HHVM = 81,
 
-    /// \brief HHVM calling convention for invoking C/C++ helpers.
+    /// HHVM calling convention for invoking C/C++ helpers.
     HHVM_C = 82,
 
     /// X86_INTR - x86 hardware interrupt context. Callee may take one or two