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[LoopPredication] Add testcase showing BPI computation. NFC

Authored by anna on Sep 27 2021, 1:52 PM.

Description

[LoopPredication] Add testcase showing BPI computation. NFC

Precommit testcase for D110438. Since we do not preserve BPI in loop
pass manager, we are forced to compute BPI everytime Loop predication is
invoked.
The patch referenced changes that behaviour by preserving lossy BPI for
loop passes.