Each space has its own bitmap(s)

Each alloc space now has One mark+live bitmap. Each image space has only one live bitmap.

Change-Id: I2e919d1bd7d9f4d35d0e95ed83a58df6f754df6e
diff --git a/build/Android.common.mk b/build/Android.common.mk
index 74bc4a9..c6682ca 100644
--- a/build/Android.common.mk
+++ b/build/Android.common.mk
@@ -215,6 +215,7 @@
 	src/scoped_thread_list_lock_releaser.cc \
 	src/signal_catcher.cc \
 	src/space.cc \
+	src/space_bitmap.cc \
 	src/stack.cc \
 	src/stringpiece.cc \
 	src/stringprintf.cc \