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[AArch64][v8.5A] Add PSTATE manipulation instructions XAFlag and AXFlag

Authored by olista01 on Sep 27 2018, 2:11 AM.

Description

[AArch64][v8.5A] Add PSTATE manipulation instructions XAFlag and AXFlag

These new instructions manipluate the NZCV bits, to convert between the
regular Arm floating-point comare format and an alternative format.

Patch by Pablo Barrio!

Differential revision: https://reviews.llvm.org/D52473

llvm-svn: 343187

Details