Forward RNG argument in benchmark (#173) #596

Job	Run time
test (1.7, ubuntu-latest, x64)	44s
test (1.7, ubuntu-latest, x86)	1m 0s
test (1.7, windows-latest, x64)	1m 1s
test (1.7, windows-latest, x86)	1m 18s
test (1.7, macOS-latest, x64)	1m 0s
test (1, ubuntu-latest, x64)	44s
test (1, ubuntu-latest, x86)	57s
test (1, windows-latest, x64)	1m 22s
test (1, windows-latest, x86)	1m 48s
test (1, macOS-latest, x64)	1m 10s
test (nightly, ubuntu-latest, x64)	1m 14s
test (nightly, ubuntu-latest, x86)	1m 43s
test (nightly, windows-latest, x64)	1m 38s
test (nightly, windows-latest, x86)	2m 25s
test (nightly, macOS-latest, x64)	2m 47s
	20m 51s

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