Fix vm code base so that it can be built for --arch=simarm (no snapshot yet).

runtime/vm/assembler_macros_arm.h

Index: runtime/vm/assembler_macros_arm.h
===================================================================
--- runtime/vm/assembler_macros_arm.h	(revision 0)
+++ runtime/vm/assembler_macros_arm.h	(revision 0)
@@ -0,0 +1,54 @@
+// 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.
+// The class 'AssemblerMacros' contains assembler instruction groups that
+// are used in Dart.
+
+#ifndef VM_ASSEMBLER_MACROS_ARM_H_
+#define VM_ASSEMBLER_MACROS_ARM_H_
+
+#ifndef VM_ASSEMBLER_MACROS_H_
+#error Do not include assembler_macros_arm.h directly; use assembler_macros.h.
+#endif
+
+#include "vm/allocation.h"
+#include "vm/constants_arm.h"
+
+namespace dart {
+
+// Forward declarations.
+class Assembler;
+class Class;
+class Label;
+
+class AssemblerMacros : public AllStatic {
+ public:
+  // Inlined allocation of an instance of class 'cls', code has no runtime
+  // calls. Jump to 'failure' if the instance cannot be allocated here.
+  // Allocated instance is returned in 'instance_reg'.
+  // Only the tags field of the object is initialized.
+  static void TryAllocate(Assembler* assembler,
+                          const Class& cls,
+                          Label* failure,
+                          bool near_jump,
+                          Register instance_reg);
+
+  // Set up a dart frame on entry with a frame pointer and PC information to
+  // enable easy access to the RawInstruction object of code corresponding
+  // to this frame.
+  static void EnterDartFrame(Assembler* assembler, intptr_t frame_size);
+
+  // Set up a stub frame so that the stack traversal code can easily identify
+  // a stub frame.
+  static void EnterStubFrame(Assembler* assembler);
+
+  // Instruction pattern from entrypoint is used in dart frame prologs
+  // to set up the frame and save a PC which can be used to figure out the
+  // RawInstruction object corresponding to the code running in the frame.
+  static const intptr_t kOffsetOfSavedPCfromEntrypoint = -1;  // UNIMPLEMENTED.
+};
+
+}  // namespace dart.
+
+#endif  // VM_ASSEMBLER_MACROS_ARM_H_
+