scx_rlfifo: operate in a more work-conserving way #1584

Job	Run time
lint	17s
pages	0s
build-kernel	12s
layered-matrix (scx_layered, --disable-topology=false)	3m 26s
rust-test-schedulers (scx_bpfland)	8m 5s
integration-test (scx_bpfland)	3m 24s
layered-matrix (scx_layered, --disable-topology=true)	2m 48s
rust-test-schedulers (scx_lavd)	8m 37s
rust-test-core (scx_loader)	4m 20s
integration-test (scx_lavd)	3m 33s
rust-test-schedulers (scx_layered)	8m 36s
rust-test-core (scx_rustland_core)	7m 46s
integration-test (scx_layered)	4m 19s
rust-test-schedulers (scx_rlfifo)	9m 39s
rust-test-core (scx_stats)	2m 57s
integration-test (scx_rlfifo)	3m 8s
rust-test-core (scx_utils)	8m 45s
rust-test-schedulers (scx_rustland)	10m 1s
integration-test (scx_rustland)	3m 49s
rust-test-schedulers (scx_rusty)	8m 52s
integration-test (scx_rusty)	4m 0s
	1h 46m 34s

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