Don't use last instrction in the block after removing it
Don't use last instrction in the block after removing it

Summary: Asan report P81609709

Reviewed By: justinjhendrick

Differential Revision: D16914666

fbshipit-source-id: 64f8be1d4841887daef15338ecdaa6dd628b205b

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex