nikic added a comment. @nathanchance Thanks for the report. I've applied the obvious fix in https://github.com/llvm/llvm-project/commit/20962c1240691d25b21ce425313c81eed0b1b358. However, I think that this (and similar limitations relating to critical edge splitting) might actually be unnecessary since https://github.com/llvm/llvm-project/commit/7a7bba289521e6d4da199565cf72dc9eaed3d671. callbr has stricter semantics than indirectbr, and apparently updating successors of a callbr //is// supposed to be possible (because the blockaddresses used by it must be directly used in the call arguments and thus can be updated, while in the indirectbr case they may be passed indirectly).
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