Directory restructuring of object.h

Break object.h into constituent files.
Reduce number of #includes in other GC header files.
Introduce -inl.h files to avoid mirror files #include-ing each other.
Check invariants of verifier RegTypes for all constructors.

Change-Id: Iecf1171c02910ac152d52947330ef456df4043bc
diff --git a/src/jdwp/jdwp_handler.cc b/src/jdwp/jdwp_handler.cc
index cb13695..aa5a8a0 100644
--- a/src/jdwp/jdwp_handler.cc
+++ b/src/jdwp/jdwp_handler.cc
@@ -42,6 +42,9 @@
 #include "jdwp/jdwp_event.h"
 #include "jdwp/jdwp_expand_buf.h"
 #include "jdwp/jdwp_priv.h"
+#include "runtime.h"
+#include "thread.h"
+#include "UniquePtr.h"
 
 namespace art {