ART: Add object-readbarrier-inl.h

Move some read-barrier code into a new header. This prunes the
include tree for the concurrent-copying collector. Clean up other
related includes.

Test: mmma art
Change-Id: I40ce4e74f2e5d4c692529ffb4df933230b6fd73e
diff --git a/runtime/gc/collector/concurrent_copying-inl.h b/runtime/gc/collector/concurrent_copying-inl.h
index 854d0a5..8a9b11d 100644
--- a/runtime/gc/collector/concurrent_copying-inl.h
+++ b/runtime/gc/collector/concurrent_copying-inl.h
@@ -22,7 +22,7 @@
 #include "gc/accounting/space_bitmap-inl.h"
 #include "gc/heap.h"
 #include "gc/space/region_space.h"
-#include "mirror/object-inl.h"
+#include "mirror/object-readbarrier-inl.h"
 #include "lock_word.h"
 
 namespace art {
diff --git a/runtime/gc/heap.cc b/runtime/gc/heap.cc
index e08784d..df12d87 100644
--- a/runtime/gc/heap.cc
+++ b/runtime/gc/heap.cc
@@ -65,6 +65,7 @@
 #include "heap-inl.h"
 #include "image.h"
 #include "intern_table.h"
+#include "java_vm_ext.h"
 #include "jit/jit.h"
 #include "jit/jit_code_cache.h"
 #include "obj_ptr-inl.h"
diff --git a/runtime/gc/reference_processor.cc b/runtime/gc/reference_processor.cc
index 65a550e..886c950 100644
--- a/runtime/gc/reference_processor.cc
+++ b/runtime/gc/reference_processor.cc
@@ -18,6 +18,7 @@
 
 #include "base/time_utils.h"
 #include "collector/garbage_collector.h"
+#include "java_vm_ext.h"
 #include "mirror/class-inl.h"
 #include "mirror/object-inl.h"
 #include "mirror/reference-inl.h"
diff --git a/runtime/gc/system_weak_test.cc b/runtime/gc/system_weak_test.cc
index 9b601c0..dfbbd2a 100644
--- a/runtime/gc/system_weak_test.cc
+++ b/runtime/gc/system_weak_test.cc
@@ -23,6 +23,7 @@
 #include "base/mutex.h"
 #include "collector_type.h"
 #include "common_runtime_test.h"
+#include "gc_root-inl.h"
 #include "handle_scope-inl.h"
 #include "heap.h"
 #include "mirror/string.h"