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/StaticAnalyzer/Frontend/AnalysisConsumer.cpp b/lib/StaticAnalyzer/Frontend/AnalysisConsumer.cpp
index ccaa8b6..12e514b 100644
--- a/lib/StaticAnalyzer/Frontend/AnalysisConsumer.cpp
+++ b/lib/StaticAnalyzer/Frontend/AnalysisConsumer.cpp
@@ -214,7 +214,7 @@
         default:
 #define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATEFN)                    \
   case PD_##NAME:                                                              \
-    CREATEFN(*Opts.getPtr(), PathConsumers, OutDir, PP);                       \
+    CREATEFN(*Opts.get(), PathConsumers, OutDir, PP);                       \
     break;
 #include "clang/StaticAnalyzer/Core/Analyses.def"
         }