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/AST/MicrosoftCXXABI.cpp b/lib/AST/MicrosoftCXXABI.cpp
index 359e864..6870315 100644
--- a/lib/AST/MicrosoftCXXABI.cpp
+++ b/lib/AST/MicrosoftCXXABI.cpp
@@ -93,7 +93,7 @@
 }
 
 MSInheritanceAttr::Spelling CXXRecordDecl::calculateInheritanceModel() const {
-  if (!hasDefinition())
+  if (!hasDefinition() || isParsingBaseSpecifiers())
     return MSInheritanceAttr::Keyword_unspecified_inheritance;
   if (getNumVBases() > 0)
     return MSInheritanceAttr::Keyword_virtual_inheritance;