Implement ES6 rest parameters

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index dd1d34bdfb3d227073f1bf780bb312d5026a8d88..2ae4ba7085e37e1a10b3c0a73acd623034324ac5 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -94,7 +94,8 @@ namespace internal {
   V(StoreField)                             \
   V(StoreGlobal)                            \
   V(StoreTransition)                        \
-  V(StringLength)
+  V(StringLength)                           \
+  V(RestParamAccess)
 
 // List of code stubs only used on ARM 32 bits platforms.
 #if V8_TARGET_ARCH_ARM
@@ -1650,6 +1651,23 @@ class ArgumentsAccessStub: public PlatformCodeStub {
 };
 
 
+class RestParamAccessStub: public PlatformCodeStub {
+ public:
+  explicit RestParamAccessStub(Isolate* isolate) : PlatformCodeStub(isolate) { }
+
+  CallInterfaceDescriptor GetCallInterfaceDescriptor() OVERRIDE {
+    return ContextOnlyDescriptor(isolate());
+  }
+
+ private:
+  void GenerateNew(MacroAssembler* masm);
+
+  virtual void PrintName(std::ostream& os) const OVERRIDE;  // NOLINT
+
+  DEFINE_PLATFORM_CODE_STUB(RestParamAccess, PlatformCodeStub);
+};
+
+
 class RegExpExecStub: public PlatformCodeStub {
  public:
   explicit RegExpExecStub(Isolate* isolate) : PlatformCodeStub(isolate) { }