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/compiler_llvm/jni_compiler.cc b/src/compiler_llvm/jni_compiler.cc
index da55d94..e81afed 100644
--- a/src/compiler_llvm/jni_compiler.cc
+++ b/src/compiler_llvm/jni_compiler.cc
@@ -23,8 +23,8 @@
 #include "compiler.h"
 #include "compiler_llvm.h"
 #include "ir_builder.h"
+#include "mirror/object.h"
 #include "oat_compilation_unit.h"
-#include "object.h"
 #include "runtime.h"
 #include "runtime_support_func.h"
 #include "utils_llvm.h"