Revert "arm64: Disable implicit suspend checks, b/291839153."

This reverts commit 7095d049af86cb1fe834be87e6da836861618e06.

Reason for revert: Relanding the optimization

Test: testrunner.py --target --64 --optimizing
Bug: 291839153
Bug: 296563478
Change-Id: Id8fe2a413eb18e93030c325909d792d854af920c
Merged-In: I6b7c5f7a6d3f05e9c5aafcde63e2a00797cfa00b