Revert "[Polly] Ensure consistent Scop::InstStmtMap. NFC."

This reverts commit 8e06bf6b3a2e8d25e56cd52dca0cf3ff1b37b5d1.

It broke the polly-x86_64-linux-test-suite and
aosp-O3-polly-before-vectorizer-unprofitable buildbots.

GitOrigin-RevId: 8b14db636dec8afa904366a0d5499b80d7dc7034
2 files changed