[bindings] Split toInt64 into fast inline vs slow non-inline code paths.

Source/bindings/core/v8/V8Binding.h

 /*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 * Copyright (C) 2012 Ericsson AB. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
@@ skipping 447 matching lines @@
 }
 
 inline uint32_t toUInt32(v8::Handle<v8::Value> value, ExceptionState& exceptionState)
 {
     return toUInt32(value, NormalConversion, exceptionState);
 }
 
 // Convert a value to a 32-bit unsigned integer assuming the conversion cannot fail.
 uint32_t toUInt32(v8::Handle<v8::Value>);
 
+CORE_EXPORT int64_t toInt64Slow(v8::Handle<v8::Value>, IntegerConversionConfiguration, ExceptionState&);
+
 // Convert a value to a 64-bit signed integer. The conversion fails if the
 // value cannot be converted to a number or the range violated per WebIDL:
 // http://www.w3.org/TR/WebIDL/#es-long-long
-CORE_EXPORT int64_t toInt64(v8::Handle<v8::Value>, IntegerConversionConfiguration, ExceptionState&);
+inline int64_t toInt64(v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, ExceptionState& exceptionState)
+{
+    // Clamping not supported for int64_t/long long int. See Source/wtf/MathExtras.h.
+    ASSERT(configuration != Clamp);
+
+    // Fast case. The value is a 32-bit integer.
+    if (value->IsInt32())
+        return value->Int32Value();
+
+    return toInt64Slow(value, configuration, exceptionState);
+}
+
 inline int64_t toInt64(v8::Handle<v8::Value> value, ExceptionState& exceptionState)
 {
     return toInt64(value, NormalConversion, exceptionState);
 }
 
 // Convert a value to a 64-bit integer assuming the conversion cannot fail.
 int64_t toInt64(v8::Handle<v8::Value>);
 
 // Convert a value to a 64-bit unsigned integer. The conversion fails if the
 // value cannot be converted to a number or the range violated per WebIDL:
@@ skipping 552 matching lines @@
 
 // Callback functions used by generated code.
 void v8ConstructorAttributeGetterAsProperty(v8::Local<v8::String> propertyName, const v8::PropertyCallbackInfo<v8::Value>&);
 void v8ConstructorAttributeGetterAsAccessor(const v8::FunctionCallbackInfo<v8::Value>&);
 
 typedef void (*InstallTemplateFunction)(v8::Local<v8::FunctionTemplate>, v8::Isolate*);
 
 } // namespace blink
 
 #endif // V8Binding_h