Move ArenaBitVector into the runtime

Motivation is using arenas in the verifier.

Bug: 10921004
Change-Id: I3c7ed369194b2309a47b12a621e897e0f2f65fcf
diff --git a/runtime/Android.mk b/runtime/Android.mk
index 9236ffb..09d7311 100644
--- a/runtime/Android.mk
+++ b/runtime/Android.mk
@@ -25,6 +25,7 @@
   barrier.cc \
   base/allocator.cc \
   base/arena_allocator.cc \
+  base/arena_bit_vector.cc \
   base/bit_vector.cc \
   base/hex_dump.cc \
   base/logging.cc \