[es6] Re-implement rest parameters via desugaring.

src/mips/code-stubs-mips.cc

Index: src/mips/code-stubs-mips.cc
diff --git a/src/mips/code-stubs-mips.cc b/src/mips/code-stubs-mips.cc
index e20556c9808e3ace870b3086422d716068125f42..1de1701706f5ea89c70707dfd2ab224e50d9ec3c 100644
--- a/src/mips/code-stubs-mips.cc
+++ b/src/mips/code-stubs-mips.cc
@@ -1958,34 +1958,6 @@ void ArgumentsAccessStub::GenerateNewStrict(MacroAssembler* masm) {
 }
 
 
-void RestParamAccessStub::GenerateNew(MacroAssembler* masm) {
-  // sp[0] : language mode
-  // sp[4] : index of rest parameter
-  // sp[8] : number of parameters
-  // sp[12] : receiver displacement
-  // Check if the calling frame is an arguments adaptor frame.
-
-  Label runtime;
-  __ lw(a2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
-  __ lw(a3, MemOperand(a2, StandardFrameConstants::kContextOffset));
-  __ Branch(&runtime, ne, a3,
-            Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
-
-  // Patch the arguments.length and the parameters pointer.
-  __ lw(a1, MemOperand(a2, ArgumentsAdaptorFrameConstants::kLengthOffset));
-  __ sw(a1, MemOperand(sp, 2 * kPointerSize));
-  __ sll(at, a1, kPointerSizeLog2 - kSmiTagSize);
-  __ Addu(a3, a2, Operand(at));
-
-  __ Addu(a3, a3, Operand(StandardFrameConstants::kCallerSPOffset));
-  __ sw(a3, MemOperand(sp, 3 * kPointerSize));
-
-  // Do the runtime call to allocate the arguments object.
-  __ bind(&runtime);
-  __ TailCallRuntime(Runtime::kNewRestParam, 4, 1);
-}
-
-
 void RegExpExecStub::Generate(MacroAssembler* masm) {
   // Just jump directly to runtime if native RegExp is not selected at compile
   // time or if regexp entry in generated code is turned off runtime switch or