Revert "compilation fix for B-family targets"

This reverts commit d5b68a7b6eca209497b40987137ba81cf69aa0c1

Change-Id: Ib572164960afdf9c3570ea5013143794a4d7fd4e
diff --git a/runtime/mirror/class.h b/runtime/mirror/class.h
index e1a2e5d..23df6c0 100644
--- a/runtime/mirror/class.h
+++ b/runtime/mirror/class.h
@@ -62,7 +62,6 @@
 #define CLASS_OFFSET_FROM_CLZ(rshift) \
     MemberOffset((static_cast<int>(rshift) * CLASS_OFFSET_ALIGNMENT))
 
-#define IMT_SIZE 64
 #ifndef IMT_SIZE
 #error IMT_SIZE not defined
 #endif