[llvm-branch-commits] [llvm] release/18.x: [LoongArch] Make sure that the LoongArchISD::BSTRINS node uses the correct `MSB` value (#84454) (PR #84716)

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llvmbot wrote:

@heiher What do you think about merging this PR to the release branch?

https://github.com/llvm/llvm-project/pull/84716