[AMDGPU] Delete redundant s_or_b32#165261

Merged

LU-JOHN merged 15 commits intollvm:mainfrom

LU-JOHN:s_cmp_or32

Nov 7, 2025

Commits on Nov 1, 2025

Commits on Nov 3, 2025

Ensure hi/lo halves are or-ed. Add mir tests.
LU-JOHN
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