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[LoopVectorizer] Don't create unused block masks for reductions. NFC

Authored by dmgreen on Thu, Jul 30, 6:28 AM.

Description

[LoopVectorizer] Don't create unused block masks for reductions. NFC

This removes some unneeded block masks when we don't have any
reductions. It should not have any effect on codegen as the values
created are dead anyway.

Differential Revision: https://reviews.llvm.org/D81415