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

src/full-codegen/x87/full-codegen-x87.cc

Index: src/full-codegen/x87/full-codegen-x87.cc
diff --git a/src/full-codegen/x87/full-codegen-x87.cc b/src/full-codegen/x87/full-codegen-x87.cc
index 964440227fb7fb76f2021449e24789ae0e133143..bbcf2eb1250e3ef978bb6b2907153b415d3029c9 100644
--- a/src/full-codegen/x87/full-codegen-x87.cc
+++ b/src/full-codegen/x87/full-codegen-x87.cc
@@ -3235,10 +3235,12 @@ void FullCodeGenerator::EmitCreateIterResultObject(CallRuntime* expr) {
 
 
 void FullCodeGenerator::EmitLoadJSRuntimeFunction(CallRuntime* expr) {
+  // Push function.
+  __ LoadGlobalFunction(expr->context_index(), eax);
+  PushOperand(eax);
+
   // Push undefined as receiver.
   PushOperand(isolate()->factory()->undefined_value());
-
-  __ LoadGlobalFunction(expr->context_index(), eax);
 }
 
 
@@ -3263,10 +3265,6 @@ void FullCodeGenerator::VisitCallRuntime(CallRuntime* expr) {
     Comment cmnt(masm_, "[ CallRuntime");
     EmitLoadJSRuntimeFunction(expr);
 
-    // Push the target function under the receiver.
-    PushOperand(Operand(esp, 0));
-    __ mov(Operand(esp, kPointerSize), eax);
-
     // Push the arguments ("left-to-right").
     for (int i = 0; i < arg_count; i++) {
       VisitForStackValue(args->at(i));