Merge the 2019-04-01 SPL branch from AOSP-Partner

* security-aosp-nyc-mr2-release:
  [RESTRICT AUTOMERGE] Fix Integer Overflow in libpac
  [RESTRICT AUTOMERGE] Fix type confusion in libpac
  [RESTRICT AUTOMERGE] Fix OOB Access in libpac
  Fix OOB read in libpac ast-numbering.cc
  Fix type confusion in libpac

Change-Id: I1b9e4d5c9238d90d5a226295d76b822990ae709d