[FIRRTL] Fix mask repeat order in FlattenMemory#10106

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Waryc wants to merge 6 commits intollvm:mainfrom

Waryc:fix/flatten-memory-mask-order

Commits on Apr 3, 2026

fix: correct flatten-memory mask repeat ordering
Waryc
committed

Commits on Apr 5, 2026

fix: merge e2e mask repeat test
Waryc
committed