[llvm-branch-commits] [llvm] release/21.x: [RISCV][MoveMerge] Don't copy kill flag when moving past an instruction that reads the register. (#153644) (PR #153697)

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@topperc (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/153697