Reverts refactoring of CPU feature detection for

runtime/vm/cpu_x64.cc

Index: runtime/vm/cpu_x64.cc
===================================================================
--- runtime/vm/cpu_x64.cc	(revision 32559)
+++ runtime/vm/cpu_x64.cc	(working copy)
@@ -8,18 +8,13 @@
 
 #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.
 }
@@ -29,29 +24,6 @@
   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