Features for CUDA.jl conversion #322

Job	Run time
test (min, default, macOS-latest)	2m 2s
test (1, default, ubuntu-latest)	2m 46s
test (min, x86, windows-latest)	4m 32s
test (min, x86, ubuntu-latest)	2m 52s
test (min, default, windows-latest)	2m 30s
test (1, x86, ubuntu-latest)	3m 5s
test (1, x86, windows-latest)	3m 54s
test (min, default, ubuntu-latest)	2m 28s
test (1, default, macOS-latest)	2m 0s
test (1, default, windows-latest)	4m 0s
test (pre, default, ubuntu-latest)	3m 4s
test (pre, default, windows-latest)	3m 16s
test (pre, x86, ubuntu-latest)	3m 31s
test (nightly, default, windows-latest)	4m 25s
test (nightly, default, ubuntu-latest)	3m 36s
test (pre, default, macOS-latest)	2m 25s
test (pre, x86, windows-latest)	4m 24s
test (nightly, x86, windows-latest)	5m 7s
test (nightly, default, macOS-latest)	2m 38s
test (nightly, x86, ubuntu-latest)	4m 19s
	1h 6m 54s

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