Reverts refactoring of CPU feature detection for

runtime/vm/cpu_x64.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/cpu.h"
 
-#include "vm/assembler.h"
 #include "vm/constants_x64.h"
-#include "vm/cpuinfo.h"
 #include "vm/heap.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 
 namespace dart {
 
-DEFINE_FLAG(bool, use_sse41, true, "Use SSE 4.1 if available");
-
-
 void CPU::FlushICache(uword start, uword size) {
   // Nothing to be done here.
 }
 
 
 const char* CPU::Id() {
   return "x64";
 }
 
-
-bool HostCPUFeatures::sse2_supported_ = true;
-bool HostCPUFeatures::sse4_1_supported_ = false;
-char* HostCPUFeatures::hardware_ = NULL;
-#ifdef DEBUG
-bool HostCPUFeatures::initialized_ = false;
-#endif
-
-
-#define __ assembler.
-void HostCPUFeatures::InitOnce() {
-  CpuInfo::InitOnce();
-  hardware_ = CpuInfo::GetCpuModel();
-  sse4_1_supported_ =
-      CpuInfo::FieldContainsById(CpuInfo::kCpuInfoFeatures, "sse4_1") ||
-      CpuInfo::FieldContainsById(CpuInfo::kCpuInfoFeatures, "sse4.1");
-
-#ifdef DEBUG
-  initialized_ = true;
-#endif
-}
-#undef __
-
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64