Implement runtime support inlining.

Change-Id: I8608b246a4dfde9959b5b86872f65dfa61646c84
diff --git a/src/thread.h b/src/thread.h
index 2cb59d5..4f43473 100644
--- a/src/thread.h
+++ b/src/thread.h
@@ -433,6 +433,10 @@
   void PushShadowFrame(ShadowFrame* frame);
   ShadowFrame* PopShadowFrame();
 
+  static ThreadOffset TopShadowFrameOffset() {
+    return ThreadOffset(OFFSETOF_MEMBER(Thread, top_shadow_frame_));
+  }
+
   void PushSirt(StackIndirectReferenceTable* sirt);
   StackIndirectReferenceTable* PopSirt();