Remove Frame, merge shadow and quick representations.

Change-Id: I5ae03a5e52111792d2df7e83cbd89ab25777844b
diff --git a/src/thread_x86.cc b/src/thread_x86.cc
index acc38f4..6a72286 100644
--- a/src/thread_x86.cc
+++ b/src/thread_x86.cc
@@ -130,6 +130,9 @@
       : "r"(THREAD_SELF_OFFSET)  // input
       :);  // clobber
   CHECK_EQ(self_check, this);
+
+  // Sanity check other offsets.
+  CHECK_EQ(THREAD_EXCEPTION_OFFSET, OFFSETOF_MEMBER(Thread, exception_));
 }
 
 }  // namespace art