Revert "VM: New calling convention for generated code."

runtime/vm/instructions_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/cpu.h"
 #include "vm/instructions.h"
 #include "vm/object.h"
 
 namespace dart {
 
+intptr_t IndexFromPPLoad(uword start) {
+  int32_t offset = *reinterpret_cast<int32_t*>(start);
+  return ObjectPool::IndexFromOffset(offset);
+}
+
+
+uword JumpPattern::TargetAddress() const {
+  ASSERT(IsValid());
+  int index = IndexFromPPLoad(start() + 3);
+  return object_pool_.RawValueAt(index);
+}
+
+
+void JumpPattern::SetTargetAddress(uword target) const {
+  ASSERT(IsValid());
+  int index = IndexFromPPLoad(start() + 3);
+  object_pool_.SetRawValueAt(index, target);
+  // No need to flush the instruction cache, since the code is not modified.
+}
+
+
 void ShortCallPattern::SetTargetAddress(uword target) const {
   ASSERT(IsValid());
   *reinterpret_cast<uint32_t*>(start() + 1) = target - start() - kLengthInBytes;
   CPU::FlushICache(start() + 1, kWordSize);
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64