[opt:ra] Range analysis for DynamicBitSlice#3671

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cdleary wants to merge 4 commits intogoogle:mainfrom

xlsynth:cdleary/2026-01-10-dynamic-bit-slice-ra

Commits on Jan 15, 2026

Commits on Jan 25, 2026

Address review comments.
cdleary
committed

Commits on Jan 27, 2026

Reuse kConstant.
cdleary
committed