Decouple CpuFeatures from serializer state.

src/arm64/cpu-arm64.h

Index: src/arm64/cpu-arm64.h
diff --git a/src/arm64/cpu-arm64.h b/src/arm64/cpu-arm64.h
deleted file mode 100644
index 2d3dfb22e54bf6be915327f53f88a4301749342b..0000000000000000000000000000000000000000
--- a/src/arm64/cpu-arm64.h
+++ /dev/null
@@ -1,74 +0,0 @@
-// Copyright 2013 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef V8_ARM64_CPU_ARM64_H_
-#define V8_ARM64_CPU_ARM64_H_
-
-#include <stdio.h>
-#include "serialize.h"
-#include "cpu.h"
-
-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);
-
-  // 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 IsSupported(f);
-  }
-
-  // I and D cache line size in bytes.
-  static unsigned dcache_line_size();
-  static unsigned icache_line_size();
-
-  static unsigned supported_;
-
-  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 true; }
-
- private:
-#ifdef DEBUG
-  static bool initialized_;
-#endif
-
-  static unsigned found_by_runtime_probing_only_;
-  static unsigned cross_compile_;
-
-  static bool Check(CpuFeature f, unsigned set) {
-    return (set & flag2set(f)) != 0;
-  }
-
-  static unsigned flag2set(CpuFeature f) {
-    return 1u << f;
-  }
-
-  friend class PlatformFeatureScope;
-  DISALLOW_COPY_AND_ASSIGN(CpuFeatures);
-};
-
-} }  // namespace v8::internal
-
-#endif  // V8_ARM64_CPU_ARM64_H_