broadcast A matrix in qr solve #1333

Job	Run time
macos-latest: clang++ Release Pthreads	16m 2s
macos-latest: clang++ Release PaRSEC	13m 18s
macos-latest: clang++ Debug Pthreads	9m 52s
macos-latest: clang++ Debug PaRSEC	10m 58s
ubuntu-24.04: /usr/bin/g++-14 Release Pthreads	20m 49s
ubuntu-24.04: /usr/bin/g++-14 Release PaRSEC	20m 35s
ubuntu-24.04: /usr/bin/g++-14 Debug Pthreads	19m 21s
ubuntu-24.04: /usr/bin/g++-14 Debug PaRSEC	21m 19s
	2h 12m 14s

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