Partial revert of rest parameter desugaring.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 2682c14d56117af3c1394ea507b35f097f562600..2d1a5cd2d09eb1c86fa3d6bb1d8bbfd3056daf2b 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -44,6 +44,7 @@ namespace internal {
   V(MathPow)                                \
   V(ProfileEntryHook)                       \
   V(RecordWrite)                            \
+  V(RestParamAccess)                        \
   V(RegExpExec)                             \
   V(StoreBufferOverflow)                    \
   V(StoreElement)                           \
@@ -1851,6 +1852,23 @@ class ArgumentsAccessStub: public PlatformCodeStub {
 };
 
 
+class RestParamAccessStub : public PlatformCodeStub {
+ public:
+  explicit RestParamAccessStub(Isolate* isolate) : PlatformCodeStub(isolate) {}
+
+  CallInterfaceDescriptor GetCallInterfaceDescriptor() const override {
+    return ContextOnlyDescriptor(isolate());
+  }
+
+ private:
+  void GenerateNew(MacroAssembler* masm);
+
+  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) { }