[llvm] [InstrRef] Skip clobbered EntryValue register recovery (PR #142478)

[Felipe de Azevedo Piovezan via llvm-commits]

https://github.com/felipepiovezan approved this pull request.

This LGTM, but it would be nice to hear from Jeremy as well, as it's been a while since I touched this code!

https://github.com/llvm/llvm-project/pull/142478