Decouple CpuFeatures from serializer state.

src/arm/assembler-arm.h

Index: src/arm/assembler-arm.h
diff --git a/src/arm/assembler-arm.h b/src/arm/assembler-arm.h
index 1c6a7f04f86c62e025b25a6acddba4e32eb4abb0..1aaa2238a46e9cb7cdd5a28b875c1621cbbdc42e 100644
--- a/src/arm/assembler-arm.h
+++ b/src/arm/assembler-arm.h
@@ -50,71 +50,6 @@
 namespace v8 {
 namespace internal {
 
-// CpuFeatures keeps track of which features are supported by the target CPU.
-// Supported features must be enabled by a CpuFeatureScope before use.
-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);
-
-  // Display target use when compiling.
-  static void PrintTarget();
-
-  // Display features.
-  static void PrintFeatures();
-
-  // Check whether a feature is supported by the target CPU.
-  static bool IsSupported(CpuFeature f) {
-    ASSERT(initialized_);
-    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 unsigned cache_line_size() { return cache_line_size_; }
-
-  static bool VerifyCrossCompiling() {
-    return cross_compile_ == 0;
-  }
-
-  static bool VerifyCrossCompiling(CpuFeature f) {
-    unsigned mask = flag2set(f);
-    return cross_compile_ == 0 ||
-           (cross_compile_ & mask) == mask;
-  }
-
-  static bool SupportsCrankshaft() { return CpuFeatures::IsSupported(VFP3); }
-
- private:
-  static bool Check(CpuFeature f, unsigned set) {
-    return (set & flag2set(f)) != 0;
-  }
-
-  static unsigned flag2set(CpuFeature f) {
-    return 1u << f;
-  }
-
-#ifdef DEBUG
-  static bool initialized_;
-#endif
-  static unsigned supported_;
-  static unsigned found_by_runtime_probing_only_;
-  static unsigned cache_line_size_;
-
-  static unsigned cross_compile_;
-
-  friend class ExternalReference;
-  friend class PlatformFeatureScope;
-  DISALLOW_COPY_AND_ASSIGN(CpuFeatures);
-};
-
-
 // CPU Registers.
 //
 // 1) We would prefer to use an enum, but enum values are assignment-
@@ -588,11 +523,9 @@ class Operand BASE_EMBEDDED {
   // the instruction this operand is used for is a MOV or MVN instruction the
   // actual instruction to use is required for this calculation. For other
   // instructions instr is ignored.
-  bool is_single_instruction(Isolate* isolate,
-                             const Assembler* assembler,
+  bool is_single_instruction(const Assembler* assembler,
                              Instr instr = 0) const;
-  bool must_output_reloc_info(Isolate* isolate,
-                              const Assembler* assembler) const;
+  bool must_output_reloc_info(const Assembler* assembler) const;
 
   inline int32_t immediate() const {
     ASSERT(!rm_.is_valid());