Merge "Pass USE_SAFESTACK to Soong." am: 00bccf54d4
am: 5bd91e69f7

* commit '5bd91e69f79db2cee14bd18d08f6be7720d6ff5c':
  Pass USE_SAFESTACK to Soong.

Change-Id: I55b7ba71e7efdb401d5466af13895f94a3972020