Fix performance regressions due to lazy initialization.

src/platform-macos.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 40 matching lines @@
 #include <sys/sysctl.h>
 #include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
 
 #undef MAP_TYPE
 
 #include "v8.h"
 
+#include "platform-posix.h"
 #include "platform.h"
 #include "vm-state-inl.h"
 
 // Manually define these here as weak imports, rather than including execinfo.h.
 // This lets us launch on 10.4 which does not have these calls.
 extern "C" {
   extern int backtrace(void**, int) __attribute__((weak_import));
   extern char** backtrace_symbols(void* const*, int)
       __attribute__((weak_import));
   extern void backtrace_symbols_fd(void* const*, int, int)
@@ skipping 23 matching lines @@
 
 
 void OS::SetUp() {
   // Seed the random number generator. We preserve microsecond resolution.
   uint64_t seed = Ticks() ^ (getpid() << 16);
   srandom(static_cast<unsigned int>(seed));
   limit_mutex = CreateMutex();
 }
 
 
+void OS::PostSetUp() {
+  // Math functions depend on CPU features therefore they are initialized after
+  // CPU.
+  MathSetup();
+}
+
+
 // We keep the lowest and highest addresses mapped as a quick way of
 // determining that pointers are outside the heap (used mostly in assertions
 // and verification).  The estimate is conservative, i.e., not all addresses in
 // 'allocated' space are actually allocated to our heap.  The range is
 // [lowest, highest), inclusive on the low and and exclusive on the high end.
 static void* lowest_ever_allocated = reinterpret_cast<void*>(-1);
 static void* highest_ever_allocated = reinterpret_cast<void*>(0);
 
 
 static void UpdateAllocatedSpaceLimits(void* address, int size) {
@@ skipping 778 matching lines @@
 
 
 void Sampler::Stop() {
   ASSERT(IsActive());
   SamplerThread::RemoveActiveSampler(this);
   SetActive(false);
 }
 
 
 } }  // namespace v8::internal