[llvm] [Bitcode] Fix incomplete deduplication of PHI entries (PR #162860)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

I think the general approach is fine, but please keep the implementation private to BitcodeReader. This does not seem like something that should be exposed as a generic helper.

(I think you could also handle this by calling removePredecessor the appropriate number of times, though maybe that's not significantly simpler.)

https://github.com/llvm/llvm-project/pull/162860