Adds load/store from signed unscaled 9-bit offset w/ no writeback.

runtime/vm/assembler_arm64_test.cc

 // Copyright (c) 2013, 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"
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/os.h"
@@ skipping 286 matching lines @@
 ASSEMBLER_TEST_RUN(SimpleLoadStore, test) {
   typedef int (*SimpleCode)();
   EXPECT_EQ(42, EXECUTE_TEST_CODE_INT64(SimpleCode, test->entry()));
 }
 
 
 ASSEMBLER_TEST_GENERATE(SimpleLoadStoreHeapTag, assembler) {
   __ movz(R0, 43, 0);
   __ movz(R1, 42, 0);
   __ add(R2, SP, Operand(1));
-  __ str(R1, Address(R2, -1, Address::PreIndex));
-  __ ldr(R0, Address(R2, -1, Address::PostIndex));
+  __ str(R1, Address(R2, -1));
+  __ ldr(R0, Address(R2, -1));
   __ ret();
 }
 
 
 ASSEMBLER_TEST_RUN(SimpleLoadStoreHeapTag, test) {
   typedef int (*SimpleCode)();
   EXPECT_EQ(42, EXECUTE_TEST_CODE_INT64(SimpleCode, test->entry()));
 }
 
 
@@ skipping 962 matching lines @@
 
 ASSEMBLER_TEST_RUN(LoadObjectFalse, test) {
   typedef int (*SimpleCode)();
   EXPECT_EQ(reinterpret_cast<int64_t>(Bool::False().raw()),
             EXECUTE_TEST_CODE_INT64(SimpleCode, test->entry()));
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_ARCH_ARM64)