Improve performance of invokevirtual/invokeinterface with embedded imt/vtable

Add an embedded version of imt/vtable into class object. Both tables start at
fixed offset within class object so method/entry point can be loaded directly
from class object for invokeinterface/invokevirtual.

Bug: 8142917
Change-Id: I4240d58cfbe9250107c95c0708c036854c455968
diff --git a/runtime/thread.h b/runtime/thread.h
index 1b335c8..3f7c21b 100644
--- a/runtime/thread.h
+++ b/runtime/thread.h
@@ -47,7 +47,7 @@
 
 namespace gc {
 namespace collector {
-class SemiSpace;
+  class SemiSpace;
 }  // namespace collector
 }  // namespace gc
 
@@ -61,7 +61,6 @@
   template<class T> class PrimitiveArray;
   typedef PrimitiveArray<int32_t> IntArray;
   class StackTraceElement;
-  class StaticStorageBase;
   class Throwable;
 }  // namespace mirror
 class BaseMutex;