[AArch64] Refactor NEON floating-point Max/Min/Maxnm/Minnm across vector AArch64
intrinsics to use f32 types, rather than their vector equivalents.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197090 91177308-0d34-0410-b5e6-96231b3b80d8