[ConstantMerge] don't merge constants with COMDAT (#192477) After merging #190995 (now reverted) the CI failed because ConstantMerge currently merges constants with differing COMDATs. This can result in a function referencing globals with a different COMDAT than before the merge, producing a linking error when that global gets discarded. It is still possible to merge same comdats, or to merge a non-key comdat constant into a non-comdat constant.
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