[AArch64][v8.5A] Add FRINT[32,64][Z,X] instructions

These are some new variants of the "Floating-point Round to Integral"
family of instructions, which round to the nearest floating-point value
which fits in a 32- or 64-bit integer.

Patch by Pablo Barrio!

Differential revision: https://reviews.llvm.org/D52475



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@343209 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed