Add .bss support for inlining across dexfiles within Oat

We can safely reference other dexfiles within the same oat file for cross-dex inlining.

This CL makes the OptStat#NotInlinedBss drop to less than 1% of the not-inlining cases.

Test: ART tests
Change-Id: I676d48d973abf7a6f8412cf3b7bb73afd7747f31
diff --git a/CleanSpec.mk b/CleanSpec.mk
index c9200e1..f7be2d5 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -119,6 +119,7 @@
 $(call add-clean-step, find $(OUT_DIR) -name "*.oat" -o -name "*.odex" -o -name "*.art" -o -name '*.vdex' | xargs rm -f)
 $(call add-clean-step, find $(OUT_DIR) -name "*.oat" -o -name "*.odex" -o -name "*.art" -o -name '*.vdex' | xargs rm -f)
 $(call add-clean-step, find $(OUT_DIR) -name "*.oat" -o -name "*.odex" -o -name "*.art" -o -name '*.vdex' | xargs rm -f)
+$(call add-clean-step, find $(OUT_DIR) -name "*.oat" -o -name "*.odex" -o -name "*.art" -o -name '*.vdex' | xargs rm -f)
 
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST