Use emit for xgetbv on 32 bit.

BUG=106
TEST=none
Review URL: https://webrtc-codereview.appspot.com/863004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@388 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 387
+Version: 388
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 387
+#define LIBYUV_VERSION 388
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

source/cpu_id.cc

@@ -61,7 +61,8 @@ void CpuId(int cpu_info[4], int) {
 #endif
 
 // X86 CPUs have xgetbv to detect OS saves high parts of ymm registers.
-#if !defined(__CLR_VER) && defined(_MSC_VER) && (_MSC_FULL_VER >= 160040219)
+#if !defined(__CLR_VER) && defined(_M_X64) && \
+    defined(_MSC_VER) && (_MSC_FULL_VER >= 160040219)
 #define HAS_XGETBV
 static uint32 XGetBV(unsigned int xcr) {
   return static_cast<uint32>(_xgetbv(xcr));