[runtime] Move AtomicIsLockFree out of Runtime class.

R=binji@chromium.org

Review URL: https://codereview.chromium.org/1327743004

Cr-Commit-Position: refs/heads/master@{#30663}

src/runtime/runtime-atomics.cc

@@ -19,6 +19,26 @@ namespace internal {
 
 namespace {
 
+// 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 AtomicIsLockFree(uint32_t size) {
+  return size == 1 || size == 2 || size == 4 || size == 8;
+}
+
+#else
+
+#define ATOMICS_REQUIRE_LOCK_64_BIT 1
+
+inline bool AtomicIsLockFree(uint32_t size) {
+  return size == 1 || size == 2 || size == 4;
+}
+
+#endif
+
 #if V8_CC_GNU
 
 template <typename T>
@@ -826,9 +846,7 @@ RUNTIME_FUNCTION(Runtime_AtomicsIsLockFree) {
   DCHECK(args.length() == 1);
   CONVERT_NUMBER_ARG_HANDLE_CHECKED(size, 0);
   uint32_t usize = NumberToUint32(*size);
-
-  return Runtime::AtomicIsLockFree(usize) ? isolate->heap()->true_value()
-                                          : isolate->heap()->false_value();
+  return isolate->heap()->ToBoolean(AtomicIsLockFree(usize));
 }
 }
 }  // namespace v8::internal

src/runtime/runtime.h

@@ -1215,8 +1215,6 @@ class Runtime : public AllStatic {
   // runtime-scopes.cc then.
   static base::SmartArrayPointer<Handle<Object>> GetCallerArguments(
       Isolate* isolate, int prefix_argc, int* total_argc);
-
-  static bool AtomicIsLockFree(uint32_t size);
 };
 
 
@@ -1233,29 +1231,6 @@ 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