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[GlobalISel][AArch64] Save a copy on G_SELECT by fixing condition to GPR

Authored by paquette on Jul 23 2019, 2:39 PM.

Description

[GlobalISel][AArch64] Save a copy on G_SELECT by fixing condition to GPR

The condition can never be fed by FPRs, so it should always be on a GPR.

Differential Revision: https://reviews.llvm.org/D65157

llvm-svn: 366854