[GlobalOpt] Fix unreachable ifunc globalopt crash (#157332) (#157593) Also fixes (#131488) Unreachable case is triggering `Callees.empty()` assert. Since this was [originally ](https://github.com/llvm/llvm-project/pull/87939/commits/02bd5a7013c558f1e5220fc89bafa68f40276549#diff-06aba0dac2a263dc14297a15655291d5506b760f54a736385bcf3208f83df843R2524) a `continue` anyway, have applied that as a fix and added a test case. Please let me know if there's a better way. Not sure who/how to get folks to review, tagging a few people (apologies if you're not the right person/this is the wrong way to do it, please let me know what to do in future if so) @labrinea @dtcxzyw @nikic @fhahn
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