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[MSAN] Instrument freeze instruction by clearing shadow

Authored by guiand on Jul 31 2020, 11:53 AM.

Description

[MSAN] Instrument freeze instruction by clearing shadow

Freeze always returns a defined value. This also prevents msan from
checking the input shadow, which happened because freeze wasn't
explicitly visited.

Differential Revision: https://reviews.llvm.org/D85040