[llvm-branch-commits] [llvm] release/18.x: [DAGCombiner] In mergeTruncStore, make sure we aren't storing shifted in bits. (#90939) (PR #91038)

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AtariDreams wrote:

> @AtariDreams I've noticed you've filed a lot of backport requests.  How are you choosing which fixes to backport? Is there a specific use case you care about?

There a particular LLVM miscompile bug in WebKit I'm trying to figure out. It's been there since 2019. Backports is literally just avoiding miscompilations

https://github.com/llvm/llvm-project/pull/91038