[ARM,MVE] Add missing tests for vqdmlash intrinsics.
These were accidentally left out of D76123. I added tests for the
other three instructions in this small cross-product family (vqdmlah,
vqrdmlah, vqrdmlash) but missed this one.
Reviewed By: miyuki
Subscribers: kristof.beyls, dmgreen, cfe-commits
Differential Revision: https://reviews.llvm.org/D76714