use LinearSolve precs setup #36

Job	Run time
test (Core, min, ubuntu-latest)	47m 41s
test (Core, min, macos-latest)	57m 42s
test (Core, min, windows-latest)	55m 55s
test (Core, 1, ubuntu-latest)	49m 35s
test (Core, 1, macos-latest)	1h 43m 42s
test (Core, 1, windows-latest)	53m 18s
test (Downstream, min, ubuntu-latest)	11m 30s
test (Downstream, min, macos-latest)	6m 57s
test (Downstream, min, windows-latest)	14m 30s
test (Downstream, 1, ubuntu-latest)	10m 19s
test (Downstream, 1, macos-latest)	9m 34s
test (Downstream, 1, windows-latest)	14m 19s
test (Misc, min, ubuntu-latest)	14m 1s
test (Misc, min, macos-latest)	8m 59s
test (Misc, min, windows-latest)	18m 59s
test (Misc, 1, ubuntu-latest)	12m 48s
test (Misc, 1, macos-latest)	10m 34s
test (Misc, 1, windows-latest)	16m 52s
test (Wrappers, min, ubuntu-latest)	11m 22s
test (Wrappers, min, macos-latest)	9m 4s
test (Wrappers, min, windows-latest)	15m 31s
test (Wrappers, 1, ubuntu-latest)	10m 40s
test (Wrappers, 1, macos-latest)	10m 29s
test (Wrappers, 1, windows-latest)	14m 29s
	9h 48m 50s

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