[X86][AVX512] Update VPBROADCASTQ test to combine from VPERMQ instead of VPERMI2Q. 

VPERMI2Q doesn't have shuffle decoding from re-materializable constants.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@295736 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed