[Feature] Faster RNNs (no split) #9609

Job	Run time
build-wheel-linux (3.8, cp38-cp38, --index-url https://download.pytorch.org/whl/cpu, "['cpu', '11...	1m 34s
build-wheel-linux (3.9, cp39-cp39, --index-url https://download.pytorch.org/whl/cpu, "['cpu', '11...	1m 40s
build-wheel-mac (3.8, 3.8)	2m 27s
build-wheel-windows (3.8, 3.8)	2m 46s
build-wheel-linux (3.10, cp310-cp310, --index-url https://download.pytorch.org/whl/cpu, "['cpu', ...	1m 38s
build-wheel-mac (3.9, 3.9)	2m 25s
build-wheel-windows (3.9, 3.9)	2m 49s
build-wheel-linux (3.11, cp311-cp311, --index-url https://download.pytorch.org/whl/cpu, "['cpu', ...	1m 38s
build-wheel-mac (3.10, 3.10.3)	2m 11s
build-wheel-windows (3.10, 3.10.3)	3m 31s
build-wheel-mac (3.11, 3.11)	2m 22s
build-wheel-windows (3.11, 3.11)	3m 4s
test-wheel (linux, ubuntu-20.04, 3.8)	2m 12s
test-wheel (linux, ubuntu-20.04, 3.9)	2m 32s
test-wheel (linux, ubuntu-20.04, 3.10)	2m 15s
test-wheel (linux, ubuntu-20.04, 3.11)	2m 13s
test-wheel (mac, macos-11, 3.8)	2m 51s
test-wheel (mac, macos-11, 3.9)	3m 14s
test-wheel (mac, macos-11, 3.10)	3m 2s
test-wheel (mac, macos-11, 3.11)	3m 42s
test-wheel-windows (3.8)	5m 11s
test-wheel-windows (3.9)	5m 10s
test-wheel-windows (3.10)	5m 21s
test-wheel-windows (3.11)	4m 27s
	1h 10m 15s

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