[fullcodegen] Avoid arguments juggling when calling a JS runtime function.

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

Index: src/full-codegen/mips/full-codegen-mips.cc
diff --git a/src/full-codegen/mips/full-codegen-mips.cc b/src/full-codegen/mips/full-codegen-mips.cc
index e5b7f47a5ef6c37b514517a6d8a9dea094d12988..c8cbacb68105d3ebe5f60c4e4b4e4264eb2e19b8 100644
--- a/src/full-codegen/mips/full-codegen-mips.cc
+++ b/src/full-codegen/mips/full-codegen-mips.cc
@@ -3365,11 +3365,13 @@ void FullCodeGenerator::EmitCreateIterResultObject(CallRuntime* expr) {
 
 
 void FullCodeGenerator::EmitLoadJSRuntimeFunction(CallRuntime* expr) {
+  // Push function.
+  __ LoadNativeContextSlot(expr->context_index(), v0);
+  PushOperand(v0);
+
   // Push undefined as the receiver.
   __ LoadRoot(v0, Heap::kUndefinedValueRootIndex);
   PushOperand(v0);
-
-  __ LoadNativeContextSlot(expr->context_index(), v0);
 }
 
 
@@ -3394,11 +3396,6 @@ void FullCodeGenerator::VisitCallRuntime(CallRuntime* expr) {
     Comment cmnt(masm_, "[ CallRuntime");
     EmitLoadJSRuntimeFunction(expr);
 
-    // Push the target function under the receiver.
-    __ lw(at, MemOperand(sp, 0));
-    PushOperand(at);
-    __ sw(v0, MemOperand(sp, kPointerSize));
-
     // Push the arguments ("left-to-right").
     for (int i = 0; i < arg_count; i++) {
       VisitForStackValue(args->at(i));