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/test/CodeGenCXX/conditional-gnu-ext.cpp b/test/CodeGenCXX/conditional-gnu-ext.cpp
index 44ebf98..dd93467 100644
--- a/test/CodeGenCXX/conditional-gnu-ext.cpp
+++ b/test/CodeGenCXX/conditional-gnu-ext.cpp
@@ -83,7 +83,7 @@
     // CHECK-NEXT: [[T0:%.*]] = load [[B]]** [[X]]
     // CHECK-NEXT: [[BOOL:%.*]] = call zeroext i1 @_ZN5test31BcvbEv([[B]]* [[T0]])
     // CHECK-NEXT: br i1 [[BOOL]]
-    // CHECK:      call void @_ZN5test31BC1ERKS0_([[B]]* [[RESULT:%.*]], [[B]]* [[T0]])
+    // CHECK:      call void @_ZN5test31BC1ERKS0_([[B]]* [[RESULT:%.*]], [[B]]* nonnull [[T0]])
     // CHECK-NEXT: br label
     // CHECK:      call void @_ZN5test31BC1Ev([[B]]* [[RESULT]])
     // CHECK-NEXT: br label
@@ -97,7 +97,7 @@
     // CHECK-NEXT: call  void @_ZN5test312test1_helperEv([[B]]* sret [[TEMP]])
     // CHECK-NEXT: [[BOOL:%.*]] = call zeroext i1 @_ZN5test31BcvbEv([[B]]* [[TEMP]])
     // CHECK-NEXT: br i1 [[BOOL]]
-    // CHECK:      call void @_ZN5test31BC1ERKS0_([[B]]* [[RESULT:%.*]], [[B]]* [[TEMP]])
+    // CHECK:      call void @_ZN5test31BC1ERKS0_([[B]]* [[RESULT:%.*]], [[B]]* nonnull [[TEMP]])
     // CHECK-NEXT: br label
     // CHECK:      call void @_ZN5test31BC1Ev([[B]]* [[RESULT]])
     // CHECK-NEXT: br label