Remove the rest_parameter(int*) variant, use rest_parameter() instead.

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 0c09bdf176cc986770beb1fdf0bbe9a11822dcf6..3b4bd90120e9bb845ce03c6227adb0c8e3c5ee70 100644
--- a/src/full-codegen/mips64/full-codegen-mips64.cc
+++ b/src/full-codegen/mips64/full-codegen-mips64.cc
@@ -261,9 +261,8 @@ void FullCodeGenerator::Generate() {
   }
 
   // Possibly allocate RestParameters
-  int rest_index;
-  Variable* rest_param = info->scope()->rest_parameter(&rest_index);
-  if (rest_param) {
+  Variable* rest_param = info->scope()->rest_parameter();
+  if (rest_param != nullptr) {
     Comment cmnt(masm_, "[ Allocate rest parameter array");
     if (!function_in_register_a1) {
       __ ld(a1, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));