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/Frontend/print-header-includes.c b/test/Frontend/print-header-includes.c
index aa3e397..e248c76 100644
--- a/test/Frontend/print-header-includes.c
+++ b/test/Frontend/print-header-includes.c
@@ -1,12 +1,12 @@
-// RUN: %clang_cc1 -include Inputs/test3.h -E -H -o %t.out %s 2> %t.err
-// RUN: FileCheck < %t.err %s
+// RUN: %clang_cc1 -include Inputs/test3.h -E -H -o %t.out %s 2> %t.stderr
+// RUN: FileCheck < %t.stderr %s
 
 // CHECK-NOT: test3.h
 // CHECK: . {{.*test.h}}
 // CHECK: .. {{.*test2.h}}
 
-// RUN: %clang_cc1 -include Inputs/test3.h -E --show-includes -o %t.out %s 2> %t.err
-// RUN: FileCheck --check-prefix=MS < %t.err %s
+// RUN: %clang_cc1 -include Inputs/test3.h -E --show-includes -o %t.out %s > %t.stdout
+// RUN: FileCheck --check-prefix=MS < %t.stdout %s
 // MS-NOT: test3.h
 // MS: Note: including file: {{.*test.h}}
 // MS: Note: including file:  {{.*test2.h}}