[TableGen] Use the other version of EnforceVectorEltTypeIs inside the TypeSet version of EnforceVectorEltTypeIs to reduce duplicated code. NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@253963 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed