[PATCH] D79507: [flang] Change DIE("unreachable") cases to use llvm_unreachable

[Hal Finkel via Phabricator via llvm-commits]

hfinkel added a comment.

An another thought: we might have a separate cmake flag to transform DIE -> unreachable, or some form of DIE into unreachable, so that we can test the performance difference easily going forward.


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