Enable SSE2 in snapshot in Google Chrome.

src/platform-win32.cc

Index: src/platform-win32.cc
===================================================================
--- src/platform-win32.cc	(revision 3332)
+++ src/platform-win32.cc	(working copy)
@@ -1317,7 +1317,16 @@
 
 
 uint64_t OS::CpuFeaturesImpliedByPlatform() {
+#if _M_IX86_FP == 2
+  // If the C++ compiler is using SSE2 then we can use that in the
+  // snapshot too.  SSE2 implies a bunch of other features that were
+  // invented before SSE2.  This is for MSVC++, there doesn't appear
+  // to be any equivalent for gcc.  See
+  // http://msdn.microsoft.com/en-us/library/b0084kay.aspx
+  return (1u << SSE2) | (1u << CMOV) | (1u << RDTSC) | (1u << CPUID);
+#else
   return 0;  // Windows runs on anything.
+#endif
 }