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

src/full-codegen/s390/full-codegen-s390.cc

Index: src/full-codegen/s390/full-codegen-s390.cc
diff --git a/src/full-codegen/s390/full-codegen-s390.cc b/src/full-codegen/s390/full-codegen-s390.cc
index 98d2d7c2d02167c780ffa70607dc04c71dbbc2e9..fc1fb9fdcf2feded8958e4b6d87d805249f77c28 100644
--- a/src/full-codegen/s390/full-codegen-s390.cc
+++ b/src/full-codegen/s390/full-codegen-s390.cc
@@ -3257,11 +3257,13 @@ void FullCodeGenerator::EmitCreateIterResultObject(CallRuntime* expr) {
 }
 
 void FullCodeGenerator::EmitLoadJSRuntimeFunction(CallRuntime* expr) {
+  // Push function.
+  __ LoadNativeContextSlot(expr->context_index(), r2);
+  PushOperand(r2);
+
   // Push undefined as the receiver.
   __ LoadRoot(r2, Heap::kUndefinedValueRootIndex);
   PushOperand(r2);
-
-  __ LoadNativeContextSlot(expr->context_index(), r2);
 }
 
 void FullCodeGenerator::EmitCallJSRuntimeFunction(CallRuntime* expr) {
@@ -3284,11 +3286,6 @@ void FullCodeGenerator::VisitCallRuntime(CallRuntime* expr) {
     Comment cmnt(masm_, "[ CallRuntime");
     EmitLoadJSRuntimeFunction(expr);
 
-    // Push the target function under the receiver.
-    __ LoadP(ip, MemOperand(sp, 0));
-    PushOperand(ip);
-    __ StoreP(r2, MemOperand(sp, kPointerSize));
-
     // Push the arguments ("left-to-right").
     for (int i = 0; i < arg_count; i++) {
       VisitForStackValue(args->at(i));