Allow mixing of thread offsets between 32 and 64bit architectures.

Begin a more full implementation x86-64 REX prefixes.
Doesn't implement 64bit thread offset support for the JNI compiler.

Change-Id: If9af2f08a1833c21ddb4b4077f9b03add1a05147
diff --git a/compiler/dex/quick/mips/target_mips.cc b/compiler/dex/quick/mips/target_mips.cc
index 67a44fa..1fe2bea 100644
--- a/compiler/dex/quick/mips/target_mips.cc
+++ b/compiler/dex/quick/mips/target_mips.cc
@@ -514,14 +514,14 @@
  * ensure that all branch instructions can be restarted if
  * there is a trap in the shadow.  Allocate a temp register.
  */
-RegStorage MipsMir2Lir::LoadHelper(ThreadOffset offset) {
+RegStorage MipsMir2Lir::LoadHelper(ThreadOffset<4> offset) {
   LoadWordDisp(rs_rMIPS_SELF, offset.Int32Value(), rs_rT9);
   return rs_rT9;
 }
 
 LIR* MipsMir2Lir::CheckSuspendUsingLoad() {
   RegStorage tmp = AllocTemp();
-  LoadWordDisp(rs_rMIPS_SELF, Thread::ThreadSuspendTriggerOffset().Int32Value(), tmp);
+  LoadWordDisp(rs_rMIPS_SELF, Thread::ThreadSuspendTriggerOffset<4>().Int32Value(), tmp);
   LIR *inst = LoadWordDisp(tmp, 0, tmp);
   FreeTemp(tmp);
   return inst;