Chris Lattner 0c6e0c25a1 Two NFC changes: ...

- Add a DominanceInfo::dominates helper functions that takes two instructions,
  as analogues to the properlyDominates ones.
- Further generalize some SILBuilder code to be more defensive in the face
  of incorrect or partially constructed SIL instructions.

These are cleanups, NFC.

2017-12-19 20:18:24 -08:00

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