Decouple CpuFeatures from serializer state.

src/ia32/assembler-ia32.h

Index: src/ia32/assembler-ia32.h
diff --git a/src/ia32/assembler-ia32.h b/src/ia32/assembler-ia32.h
index 6b60c12bec842eb9ca0390f9b03d183d0becee30..2ce41e0a5f7ef7909ed1f57221be1a28cf75e52f 100644
--- a/src/ia32/assembler-ia32.h
+++ b/src/ia32/assembler-ia32.h
@@ -452,73 +452,6 @@ class Displacement BASE_EMBEDDED {
 };
 
 
-
-// CpuFeatures keeps track of which features are supported by the target CPU.
-// Supported features must be enabled by a CpuFeatureScope before use.
-// Example:
-//   if (assembler->IsSupported(SSE3)) {
-//     CpuFeatureScope fscope(assembler, SSE3);
-//     // Generate code containing SSE3 instructions.
-//   } else {
-//     // Generate alternative 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(bool serializer_enabled);
-
-  // Check whether a feature is supported by the target CPU.
-  static bool IsSupported(CpuFeature f) {
-    ASSERT(initialized_);
-    if (Check(f, cross_compile_)) return true;
-    if (f == SSE3 && !FLAG_enable_sse3) return false;
-    if (f == SSE4_1 && !FLAG_enable_sse4_1) return false;
-    return Check(f, supported_);
-  }
-
-  static bool IsSafeForSnapshot(Isolate* isolate, CpuFeature f) {
-    return Check(f, cross_compile_) ||
-           (IsSupported(f) &&
-            !(Serializer::enabled(isolate) &&
-              Check(f, found_by_runtime_probing_only_)));
-  }
-
-  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;
-  }
-
-#ifdef DEBUG
-  static bool initialized_;
-#endif
-  static uint64_t supported_;
-  static uint64_t found_by_runtime_probing_only_;
-
-  static uint64_t cross_compile_;
-
-  friend class ExternalReference;
-  friend class PlatformFeatureScope;
-  DISALLOW_COPY_AND_ASSIGN(CpuFeatures);
-};
-
-
 class Assembler : public AssemblerBase {
  private:
   // We check before assembling an instruction that there is sufficient