Update LLVM prebuilts for rebase to r212749.

Change-Id: I4ab2a7671522d6d8c52e9ade72591f189f5a1670
diff --git a/renderscript/clang-include/xmmintrin.h b/renderscript/clang-include/xmmintrin.h
index e777ec0..c9befcb 100644
--- a/renderscript/clang-include/xmmintrin.h
+++ b/renderscript/clang-include/xmmintrin.h
@@ -34,8 +34,8 @@
 typedef float __v4sf __attribute__((__vector_size__(16)));
 typedef float __m128 __attribute__((__vector_size__(16)));
 
-// This header should only be included in a hosted environment as it depends on
-// a standard library to provide allocation routines.
+/* This header should only be included in a hosted environment as it depends on
+ * a standard library to provide allocation routines. */
 #if __STDC_HOSTED__
 #include <mm_malloc.h>
 #endif
@@ -589,7 +589,7 @@
   return (__m128){ __w, __w, __w, __w };
 }
 
-// Microsoft specific.
+/* Microsoft specific. */
 static __inline__ __m128 __attribute__((__always_inline__, __nodebug__))
 _mm_set_ps1(float __w)
 {