[llvm-branch-commits] [llvm] release/20.x: [SCEV] Check whether the start is non-zero in `ScalarEvolution::howFarToZero` (#131522) (PR #131568)

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@dtcxzyw (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/131568