Update Clang for rebase to r212749.

This also fixes a small issue with arm_neon.h not being generated always.

Includes a cherry-pick of:
r213450 - fixes mac-specific header issue
r213126 - removes a default -Bsymbolic on Android

Change-Id: I2a790a0f5d3b2aab11de596fc3a74e7cbc99081d
diff --git a/lib/Frontend/HeaderIncludeGen.cpp b/lib/Frontend/HeaderIncludeGen.cpp
index 6d2e378..8b2435b 100644
--- a/lib/Frontend/HeaderIncludeGen.cpp
+++ b/lib/Frontend/HeaderIncludeGen.cpp
@@ -49,7 +49,7 @@
 void clang::AttachHeaderIncludeGen(Preprocessor &PP, bool ShowAllHeaders,
                                    StringRef OutputPath, bool ShowDepth,
                                    bool MSStyle) {
-  raw_ostream *OutputFile = &llvm::errs();
+  raw_ostream *OutputFile = MSStyle ? &llvm::outs() : &llvm::errs();
   bool OwnsOutputFile = false;
 
   // Open the output file, if used.