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[ARM,MVE] Add intrinsics for the VQDMLAH family.

Authored by simon_tatham on Mar 13 2020, 2:34 AM.



These are complicated integer multiply+add instructions with extra
saturation, taking the high half of a double-width product, and
optional rounding. There's no sensible way to represent that in
standard IR, so I've converted the clang builtins directly to
target-specific intrinsics.

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