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[LV] Record memory widening decisions (NFCI)

Authored by gilr on Sep 21 2021, 8:02 AM.

Description

[LV] Record memory widening decisions (NFCI)

Record widening decisions for memory operations within the planned recipes and
use the recorded decisions in code-gen rather than querying the cost model.

Differential Revision: https://reviews.llvm.org/D110479

Details