Alina Sbirlea 6227f021ad [SimpleLoopUnswitch] Update DefaultExit condition to check unreachable is not empty.
Summary:
Update the check for the default exit block to not only check that the
terminator is not unreachable, but also check that unreachable block has
*only* the unreachable instruction.

Reviewers: chandlerc

Subscribers: hiraditya, uabelho, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D78277
2020-05-07 13:48:30 -07:00
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