NFC: SILBasicBlock utilties for handling critical edges. #20111
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The primary interfaces for CFG manipulation belong in SIL. This is just what's necessary to fix SILCloner.
A follow up commit adds an API for SILCloner clients to set mapped values. Calling the map lookup "remap" would be unacceptably misleading.
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@swift-ci test. |
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This is in preparation for a SILCloner cleanup PR (round 2/2).
Don't look at the combined diff.
I extracted the trivial cleanup into a serious of commits that are
individually very easy to review.