As a follow-on for #87986, moves the VectorType convenience wrappers (`FixedVectorType` and `ScalableVectorType`) to BuiltinTypes.h. This allows us to use the new wrappers in "CommonTypeConstraints.td".
As a follow-on for #87986, moves the VectorType convenience wrappers (`FixedVectorType` and `ScalableVectorType`) to BuiltinTypes.h. This allows us to use the new wrappers in "CommonTypeConstraints.td".