Fixes to support ARMv5 lego mindstorm.

runtime/vm/assembler_arm.h

 // 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.
 
 #ifndef VM_ASSEMBLER_ARM_H_
 #define VM_ASSEMBLER_ARM_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_arm.h directly; use assembler.h instead.
 #endif
 
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/constants_arm.h"
+#include "vm/cpu.h"
 #include "vm/object.h"
 #include "vm/simulator.h"
 
 namespace dart {
 
 // Forward declarations.
 class RuntimeEntry;
 
 class Label : public ValueObject {
  public:
@@ skipping 742 matching lines @@
   void EnterOsrFrame(intptr_t extra_size);
 
   // Set up a stub frame so that the stack traversal code can easily identify
   // a stub frame.
   void EnterStubFrame(bool load_pp = false);
   void LeaveStubFrame();
 
   // 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 kEntryPointToPcMarkerOffset = Instr::kPCReadOffset;
+  static intptr_t EntryPointToPcMarkerOffset() {
+    return TargetCPUFeatures::store_pc_read_offset();
+  }
 
   void UpdateAllocationStats(intptr_t cid,
                              Register temp_reg,
                              Heap::Space space = Heap::kNew);
 
   void UpdateAllocationStatsWithSize(intptr_t cid,
                                      Register size_reg,
                                      Register temp_reg,
                                      Heap::Space space = Heap::kNew);
 
@@ skipping 175 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_ARM_H_