[runtime] Move AtomicIsLockFree out of Runtime class.

src/runtime/runtime.h

 // Copyright 2012 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_RUNTIME_RUNTIME_H_
 #define V8_RUNTIME_RUNTIME_H_
 
 #include "src/allocation.h"
 #include "src/objects.h"
 #include "src/unicode.h"
@@ skipping 1197 matching lines @@
                                                     Handle<Object>);
 
   // Find the arguments of the JavaScript function invocation that called
   // into C++ code. Collect these in a newly allocated array of handles
   // (possibly prefixed by a number of empty handles).
   // TODO(mstarzinger): Temporary workaround until this is only used by the
   // %_Arguments and %_ArgumentsLength intrinsics. Make this function local to
   // runtime-scopes.cc then.
   static base::SmartArrayPointer<Handle<Object>> GetCallerArguments(
       Isolate* isolate, int prefix_argc, int* total_argc);
-
-  static bool AtomicIsLockFree(uint32_t size);
 };
 
 
 std::ostream& operator<<(std::ostream&, Runtime::FunctionId);
 
 //---------------------------------------------------------------------------
 // Constants used by interface to runtime functions.
 
 class AllocateDoubleAlignFlag : public BitField<bool, 0, 1> {};
 class AllocateTargetSpace : public BitField<AllocationSpace, 1, 3> {};
 
 class DeclareGlobalsEvalFlag : public BitField<bool, 0, 1> {};
 class DeclareGlobalsNativeFlag : public BitField<bool, 1, 1> {};
 STATIC_ASSERT(LANGUAGE_END == 3);
 class DeclareGlobalsLanguageMode : public BitField<LanguageMode, 2, 2> {};
 
-//---------------------------------------------------------------------------
-// Inline functions
-
-// Assume that 32-bit architectures don't have 64-bit atomic ops.
-// TODO(binji): can we do better here?
-#if V8_TARGET_ARCH_64_BIT && V8_HOST_ARCH_64_BIT
-
-#define ATOMICS_REQUIRE_LOCK_64_BIT 0
-
-inline bool Runtime::AtomicIsLockFree(uint32_t size) {
-  return size == 1 || size == 2 || size == 4 || size == 8;
-}
-
-#else
-
-#define ATOMICS_REQUIRE_LOCK_64_BIT 1
-
-inline bool Runtime::AtomicIsLockFree(uint32_t size) {
-  return size == 1 || size == 2 || size == 4;
-}
-
-#endif
-
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_RUNTIME_RUNTIME_H_