[CodeGen] Correctly implement the AVX512 psABI rules

An __m512 vector type wrapped in a structure should be passed in a
vector register.

Our prior implementation was based on a draft version of the psABI.

This fixes PR28975.

N.B. The update to the ABI was made here:
https://github.com/hjl-tools/x86-psABI/commit/30f9c9

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@278655 91177308-0d34-0410-b5e6-96231b3b80d8