disable assembly in header for msan=1

include/libyuv/rotate_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_ROTATE_ROW_H_  // NOLINT
 #define INCLUDE_LIBYUV_ROTATE_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
+#if defined(__has_feature)
+#if __has_feature(memory_sanitizer)
+#define LIBYUV_DISABLE_X86
+#endif
+#endif
 // The following are available for Visual C and clangcl 32 bit:
 #if !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86)
 #define HAS_TRANSPOSEWX8_SSSE3
 #define HAS_TRANSPOSEUVWX8_SSE2
 #endif
 
 // The following are available for GCC 32 or 64 bit but not NaCL for 64 bit:
 #if !defined(LIBYUV_DISABLE_X86) && \
     (defined(__i386__) || (defined(__x86_64__) && !defined(__native_client__)))
 #define HAS_TRANSPOSEWX8_SSSE3
@@ skipping 71 matching lines @@
 void TransposeUVWx8_Any_DSPR2(const uint8* src, int src_stride,
                               uint8* dst_a, int dst_stride_a,
                               uint8* dst_b, int dst_stride_b, int width);
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif
 
 #endif  // INCLUDE_LIBYUV_ROTATE_ROW_H_  NOLINT