Make qrfact and qrfact! type-stable #11240
Merged
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As reported in http://stackoverflow.com/questions/30155465/fast-tensor-initialisation-in-julia, qr factorization is not type-stable. This fixes part of the problem, but it's not enough on its own to make
qrtype-stable (even if you supply aVal{true}). I suspect it comes down to theF[:Q]syntax. This is just drive-by bugfixing, so I didn't make any difficult decisions.