[CodeGen] Implement widening for partial.reduce.add#161834

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sdesmalen-arm wants to merge 3 commits intollvm:mainfrom

sdesmalen-arm:implement-partial-reduce-widening

Commits on Oct 3, 2025

[CodeGen] Implement widening for partial.reduce.add
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Add missing CHECK lines, also use poison iso zero, for widened result lanes
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Commits on Oct 8, 2025

Add widening of the operands to make sure both accumulator and input vector have a known scalar factor.
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