Merge "Pass USE_SAFESTACK to Soong."
am: 00bccf54d4

* commit '00bccf54d4b3847cf54f6507c8fa29eabf26f2e7':
  Pass USE_SAFESTACK to Soong.

Change-Id: I9258135b2debee97b21de27232a7530780a63f5d