disable assembly in header for msan=1

include/libyuv/compare_row.h

 /*
  *  Copyright 2013 The LibYuv Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS. All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef INCLUDE_LIBYUV_COMPARE_ROW_H_  // NOLINT
 #define INCLUDE_LIBYUV_COMPARE_ROW_H_
 
 #include "libyuv/basic_types.h"
 
 #ifdef __cplusplus
 namespace libyuv {
 extern "C" {
 #endif
 
 #if defined(__pnacl__) || defined(__CLR_VER) || \
     (defined(__i386__) && !defined(__SSE2__))
 #define LIBYUV_DISABLE_X86
 #endif
+// MemorySanitizer does not support assembly code yet. http://crbug.com/344505

[wtc1, 2016/03/16 17:24:55]

Frank: do you know whether it's just inline assembly code in C/C++ files or all
assembly code (including the assembly code in .s/.S files) that MemorySanitizer
doesn't support?

+#if defined(__has_feature)
+#if __has_feature(memory_sanitizer)
+#define LIBYUV_DISABLE_X86
+#endif
+#endif
 
 // Visual C 2012 required for AVX2.
 #if defined(_M_IX86) && !defined(__clang__) && \
     defined(_MSC_VER) && _MSC_VER >= 1700
 #define VISUALC_HAS_AVX2 1
 #endif  // VisualStudio >= 2012
 
 // clang >= 3.4.0 required for AVX2.
 #if defined(__clang__) && (defined(__x86_64__) || defined(__i386__))
 #if (__clang_major__ > 3) || (__clang_major__ == 3 && (__clang_minor__ >= 4))
@@ skipping 34 matching lines @@
 uint32 HashDjb2_C(const uint8* src, int count, uint32 seed);
 uint32 HashDjb2_SSE41(const uint8* src, int count, uint32 seed);
 uint32 HashDjb2_AVX2(const uint8* src, int count, uint32 seed);
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif
 
 #endif  // INCLUDE_LIBYUV_COMPARE_ROW_H_  NOLINT