Disable implicit-integer-sign-change by default.

* New clang compiler makes some integer santizers enabling
  implicit-integer-sign-change, but Android code does not
  boot with this new sanitizer yet.

Bug: 119329758
Test: build and boot with new clang compiler
Change-Id: Ic80cde49d3ef51277fbe2a0aa8c1b8f2f8bfd80c