Put PushArgument into the environment instead of raw values.

runtime/vm/flow_graph_compiler_x64.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "lib/error.h"
@@ skipping 21 matching lines @@
   __ Bind(entry_label());
 
   if (deoptimization_env_ == NULL) {
     // TODO(srdjan): Deprecate once non-SSA optimizing compiler is removed.
     for (intptr_t i = 0; i < registers_.length(); i++) {
       if (registers_[i] != kNoRegister) {
         __ pushq(registers_[i]);
       }
     }
   }
+
   if (compiler->IsLeaf()) {
     __ Comment("Leaf method, lazy PC marker setup");
     // TODO(srdjan): Can we use TMP instead of RAX? We must guarantee that
     // TMP is never part of deoptimization environment.
     __ pushq(RAX);  // Preserve RAX.
     Label L;
     __ call(&L);
     const intptr_t offset = assem->CodeSize();
     __ Bind(&L);
     __ popq(RAX);
@@ skipping 1141 matching lines @@
 void ParallelMoveResolver::Exchange(const Address& mem1, const Address& mem2) {
   __ Exchange(mem1, mem2);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64