Fix performance regressions due to lazy initialization.

src/platform-linux.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 39 matching lines @@
 #include <execinfo.h>   // backtrace, backtrace_symbols
 #endif  // def __GLIBC__
 #include <strings.h>    // index
 #include <errno.h>
 #include <stdarg.h>
 
 #undef MAP_TYPE
 
 #include "v8.h"
 
+#include "platform-posix.h"
 #include "platform.h"
 #include "v8threads.h"
 #include "vm-state-inl.h"
 
 
 namespace v8 {
 namespace internal {
 
 // 0 is never a valid thread id on Linux since tids and pids share a
 // name space and pid 0 is reserved (see man 2 kill).
@@ skipping 28 matching lines @@
 #if USE_EABI_HARDFLOAT
     PrintF("ERROR: Binary not compiled with -mfloat-abi=hard but with "
            "-DUSE_EABI_HARDFLOAT\n");
     exit(1);
 #endif
   }
 #endif
 }
 
 
+void OS::PostSetUp() {
+  // Math functions depend on CPU features therefore they are initialized after
+  // CPU.
+  MathSetup();
+}
+
+
 uint64_t OS::CpuFeaturesImpliedByPlatform() {
   return 0;  // Linux runs on anything.
 }
 
 
 #ifdef __arm__
 static bool CPUInfoContainsString(const char * search_string) {
   const char* file_name = "/proc/cpuinfo";
   // This is written as a straight shot one pass parser
   // and not using STL string and ifstream because,
@@ skipping 1131 matching lines @@
 
 
 void Sampler::Stop() {
   ASSERT(IsActive());
   SignalSender::RemoveActiveSampler(this);
   SetActive(false);
 }
 
 
 } }  // namespace v8::internal