74e4694b8c
\#92331 tried to make `ObjCARCContractPass` by default, but it caused a
regression on O0 builds and was reverted.
This patch trys to bring that back by:
1. reverts the
[revert](1579e9ca9c).
2. `createObjCARCContractPass` only on optimized builds.
Tests are updated to refelect the changes. Specifically, all `O0` tests
should not include `ObjCARCContractPass`
Signed-off-by: Peter Rong <PeterRong@meta.com>