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[NFC] Introduce API to detect tokens penetrating LCSSA form
Following discussion in PR56243, we need to somehow detect the situation when token values penetrate LCSSA form for transforms that require that it is maintained by all values (for example, to sustain use-def dominance invarians). This patch introduces a parameter to LCSSA checkers to control their ignorance about tokens. Differential Revision: https://reviews.llvm.org/D129983 Reviewed By: efriedma
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