Roman Lebedev 51a25846c1 [CodeGen] SafeStack: preserve DominatorTree if it is avaliable ...

While this is mostly NFC right now, because only ARM happens
to run this pass with DomTree available before it,
and required after it, more backends will be affected once
the SimplifyCFG's switch for domtree preservation is flipped,
and DwarfEHPrepare also preserves the domtree.

2021-01-27 18:32:35 +03:00

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