Optimize jobserver `try_acquire` #1422

Job	Run time	Billable time
Test build-std (aarch64-tvos)	4m 56s	0s
Test build-std (aarch64-tvos-sim)	2m 50s	0s
Clippy	11s	0s
Test CUDA support	33s	0s
Test build-std (x86_64-tvos)	5m 2s	0s
MSRV (ubuntu-latest)	32s	0s
Rustfmt	9s	0s
MSRV (windows-latest)	48s	0s
Test (stable)	41s	0s
Test (beta)	42s	0s
Test (nightly)	35s	0s
Test (linux32)	1m 18s	0s
Test (macos)	3m 5s	0s
Test (aarch64-macos)	51s	0s
Test (aarch64-ios)	1m 42s	0s
Test (win32)	1m 39s	0s
Test (win64)	2m 7s	0s
Test (mingw32)	1m 50s	0s
Test (mingw64)	1m 42s	0s
Test (windows-2019)	2m 40s	0s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	1m 54s	0s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	3m 2s	0s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	2m 3s	0s
	40m 52s	0s

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