[llvm-branch-commits] [llvm] release/21.x: [LoongArch] Add `isSafeToMove` hook to prevent unsafe instruction motion (#163725) (PR #166936)

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@llvmbot (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix.  When you are done, please add the release:note label to this PR. 

https://github.com/llvm/llvm-project/pull/166936