Simplified CPU/CpuFeatures a bit.

src/x64/assembler-x64.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 432 matching lines @@
 //   if (assembler->IsSupported(SSE3)) {
 //     CpuFeatureScope fscope(assembler, SSE3);
 //     // Generate SSE3 floating point code.
 //   } else {
 //     // Generate standard SSE2 floating point code.
 //   }
 class CpuFeatures : public AllStatic {
  public:
   // Detect features of the target CPU. Set safe defaults if the serializer
   // is enabled (snapshots must be portable).
-  static void Probe();
+  static void Probe(bool serializer_enabled);
 
   // Check whether a feature is supported by the target CPU.
   static bool IsSupported(CpuFeature f) {
     if (Check(f, cross_compile_)) return true;
     ASSERT(initialized_);
     if (f == SSE3 && !FLAG_enable_sse3) return false;
     if (f == SSE4_1 && !FLAG_enable_sse4_1) return false;
     if (f == CMOV && !FLAG_enable_cmov) return false;
     if (f == SAHF && !FLAG_enable_sahf) return false;
     return Check(f, supported_);
@@ skipping 13 matching lines @@
   static bool VerifyCrossCompiling() {
     return cross_compile_ == 0;
   }
 
   static bool VerifyCrossCompiling(CpuFeature f) {
     uint64_t mask = flag2set(f);
     return cross_compile_ == 0 ||
            (cross_compile_ & mask) == mask;
   }
 
+  static bool SupportsCrankshaft() { return true; }
+
  private:
   static bool Check(CpuFeature f, uint64_t set) {
     return (set & flag2set(f)) != 0;
   }
 
   static uint64_t flag2set(CpuFeature f) {
     return static_cast<uint64_t>(1) << f;
   }
 
   // Safe defaults include CMOV for X64. It is always available, if
@@ skipping 1155 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_ASSEMBLER_X64_H_