MSan does not understand inline asm. This change preinitializes cpuid

src/platform-posix.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 196 matching lines @@
 }
 
 
 void* OS::GetRandomMmapAddr() {
 #if V8_OS_NACL
   // TODO(bradchen): restore randomization once Native Client gets
   // smarter about using mmap address hints.
   // See http://code.google.com/p/nativeclient/issues/3341
   return NULL;
 #endif
+#if defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER) || \
+    defined(THREAD_SANITIZER)
+  // Dynamic tools do not support custom mmap addresses.
+  return NULL;
+#endif
   Isolate* isolate = Isolate::UncheckedCurrent();
   // Note that the current isolate isn't set up in a call path via
   // CpuFeatures::Probe. We don't care about randomization in this case because
   // the code page is immediately freed.
   if (isolate != NULL) {
     uintptr_t raw_addr;
     isolate->random_number_generator()->NextBytes(&raw_addr, sizeof(raw_addr));
 #if V8_TARGET_ARCH_X64
     // Currently available CPUs have 48 bits of virtual addressing.  Truncate
     // the hint address to 46 bits to give the kernel a fighting chance of
@@ skipping 574 matching lines @@
 
 void Thread::SetThreadLocal(LocalStorageKey key, void* value) {
   pthread_key_t pthread_key = LocalKeyToPthreadKey(key);
   int result = pthread_setspecific(pthread_key, value);
   ASSERT_EQ(0, result);
   USE(result);
 }
 
 
 } }  // namespace v8::internal