[llvm] [InstSimplify] Fold value-preserving zext/sext of trunc (PR #204089)

[Nikita Popov via llvm-commits]

nikic wrote:

Please make sure that pull request descriptions do not contain any extraneous information or formatting.

(Hint: Information about test coverage, executed tests, or similar, is almost always unnecessary.)

https://github.com/llvm/llvm-project/pull/204089