[es6] Re-implement rest parameters via desugaring.

src/full-codegen/mips/full-codegen-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_MIPS
 
 // Note on Mips implementation:
 //
 // The result_register() for mips is the 'v0' register, which is defined
 // by the ABI to contain function return values. However, the first
@@ skipping 277 matching lines @@
           MemOperand(a2, ConstructFrameConstants::kOriginalConstructorOffset));
     __ Branch(&done);
 
     __ bind(&non_construct_frame);
     __ LoadRoot(v0, Heap::kUndefinedValueRootIndex);
     __ bind(&done);
 
     SetVar(new_target_var, v0, a2, a3);
   }
 
-  // Possibly allocate RestParameters
-  int rest_index;
-  Variable* rest_param = scope()->rest_parameter(&rest_index);
-  if (rest_param) {
-    Comment cmnt(masm_, "[ Allocate rest parameter array");
-
-    int num_parameters = info->scope()->num_parameters();
-    int offset = num_parameters * kPointerSize;
-
-    __ Addu(a3, fp,
-            Operand(StandardFrameConstants::kCallerSPOffset + offset));
-    __ li(a2, Operand(Smi::FromInt(num_parameters)));
-    __ li(a1, Operand(Smi::FromInt(rest_index)));
-    __ li(a0, Operand(Smi::FromInt(language_mode())));
-    __ Push(a3, a2, a1, a0);
-    function_in_register_a1 = false;
-
-    RestParamAccessStub stub(isolate());
-    __ CallStub(&stub);
-
-    SetVar(rest_param, v0, a1, a2);
-  }
-
   Variable* arguments = scope()->arguments();
   if (arguments != NULL) {
     // Function uses arguments object.
     Comment cmnt(masm_, "[ Allocate arguments object");
     if (!function_in_register_a1) {
       // Load this again, if it's used by the local context below.
       __ lw(a3, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
     } else {
       __ mov(a3, a1);
     }
@@ skipping 5013 matching lines @@
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS