[runtime] Optimize and unify rest parameters.

src/full-codegen/mips64/full-codegen-mips64.cc

Index: src/full-codegen/mips64/full-codegen-mips64.cc
diff --git a/src/full-codegen/mips64/full-codegen-mips64.cc b/src/full-codegen/mips64/full-codegen-mips64.cc
index 3ca8d78e86e1017b81fe6ee6628c37de94223831..d86479833c661ccab3bf7a3e028a91559e8c6fbe 100644
--- a/src/full-codegen/mips64/full-codegen-mips64.cc
+++ b/src/full-codegen/mips64/full-codegen-mips64.cc
@@ -272,21 +272,12 @@ void FullCodeGenerator::Generate() {
   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;
-
-    __ li(RestParamAccessDescriptor::parameter_count(),
-          Operand(Smi::FromInt(num_parameters)));
-    __ Daddu(RestParamAccessDescriptor::parameter_pointer(), fp,
-             Operand(StandardFrameConstants::kCallerSPOffset + offset));
-    __ li(RestParamAccessDescriptor::rest_parameter_index(),
-          Operand(Smi::FromInt(rest_index)));
-    function_in_register_a1 = false;
-
-    RestParamAccessStub stub(isolate());
+    if (!function_in_register_a1) {
+      __ lw(a1, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+    }
+    FastNewRestParameterStub stub(isolate());
     __ CallStub(&stub);
-
+    function_in_register_a1 = false;
     SetVar(rest_param, v0, a1, a2);
   }