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[VE] Update ISel patterns for select instruction

Authored by kaz7 on Oct 15 2020, 2:24 PM.

Description

[VE] Update ISel patterns for select instruction

Add an ISel pattern for fp128 select instruction and optimize generated
code for other types' select. instructions. Add a regression test also.

Reviewed By: simoll

Differential Revision: https://reviews.llvm.org/D89509

Details