[PATCH] D92571: [IR] Remove CastInst::isCastable since it is not used

[Duncan P. N. Exon Smith via Phabricator via llvm-commits]

dexonsmith accepted this revision.
dexonsmith added a comment.

LGTM too if you drop the libcxxabi change.

If there's an out-of-tree user that needs this we can revert again if it makes sense to (in which case, it'd be better to change `getCastOpcode` to return an `Optional<Instruction::CastOps>`, so we're not having to keep two functions in sync like this...).


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D92571/new/

https://reviews.llvm.org/D92571