Clean up enums in RegionSpace.

Split enum RegionState into two enums, RegionState and
RegionType. Merge the latter with SubSpaceType.

Use RefToRegionUnlocked in RegionSpace::AddLiveBytes.

Turn some CHECKs into DCHECKs.

Improve the Ritz EAAC run time and the GC time by ~20%.

Bug: 12687968
Change-Id: Icdb8ab3e9ec2a1eefc8c9a2e4bb19befcf2562a6
diff --git a/runtime/Android.mk b/runtime/Android.mk
index 8a4b8c0..78c692d 100644
--- a/runtime/Android.mk
+++ b/runtime/Android.mk
@@ -300,6 +300,7 @@
   gc/collector/gc_type.h \
   gc/allocator_type.h \
   gc/collector_type.h \
+  gc/space/region_space.h \
   gc/space/space.h \
   gc/heap.h \
   instrumentation.h \