[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 This bug has existed since at least LLVM 10. What makes it a candidate for backporting?

At best, if the code triggers, we abort the fold, so there is no risk of anything crazy going on if this is added.

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