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

src/full-codegen/arm64/full-codegen-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 3156 matching lines @@
 
   __ Bind(&runtime);
   CallRuntimeWithOperands(Runtime::kCreateIterResultObject);
 
   __ Bind(&done);
   context()->Plug(x0);
 }
 
 
 void FullCodeGenerator::EmitLoadJSRuntimeFunction(CallRuntime* expr) {
+  // Push function.
+  __ LoadNativeContextSlot(expr->context_index(), x0);
+  PushOperand(x0);
+
   // Push undefined as the receiver.
   __ LoadRoot(x0, Heap::kUndefinedValueRootIndex);
   PushOperand(x0);
-
-  __ LoadNativeContextSlot(expr->context_index(), x0);
 }
 
 
 void FullCodeGenerator::EmitCallJSRuntimeFunction(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   int arg_count = args->length();
 
   SetCallPosition(expr);
   __ Peek(x1, (arg_count + 1) * kPointerSize);
   __ Mov(x0, arg_count);
   __ Call(isolate()->builtins()->Call(ConvertReceiverMode::kNullOrUndefined),
           RelocInfo::CODE_TARGET);
   OperandStackDepthDecrement(arg_count + 1);
 }
 
 
 void FullCodeGenerator::VisitCallRuntime(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   int arg_count = args->length();
 
   if (expr->is_jsruntime()) {
     Comment cmnt(masm_, "[ CallRunTime");
     EmitLoadJSRuntimeFunction(expr);
 
-    // Push the target function under the receiver.
-    PopOperand(x10);
-    PushOperands(x0, x10);
-
     for (int i = 0; i < arg_count; i++) {
       VisitForStackValue(args->at(i));
     }
 
     PrepareForBailoutForId(expr->CallId(), NO_REGISTERS);
     EmitCallJSRuntimeFunction(expr);
 
     // Restore context register.
     __ Ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
 
@@ skipping 995 matching lines @@
   }
 
   return INTERRUPT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64