Make generated identifiers of private fields deterministic #744

Job	Run time
cargo-doc (ubuntu)	25s
cargo-lock	7s
cargo-fmt	16s
cargo-machete	4s
cargo-doc (windows)	1m 33s
cargo-miri	1m 40s
compilation-benchmarks	2m 8s
prettier	9s
cargo-doc (macos)	31s
taplo-fmt	4s
runtime-benchmarks (args_3)	1m 2s
test-msrv (ubuntu)	1m 10s
runtime-benchmarks (args_5)	57s
test-stable (ubuntu)	1m 22s
test-msrv (windows)	1m 45s
test-unstable (beta)	31s
runtime-benchmarks (args_10_alloc)	50s
test-msrv (macos)	1m 36s
test-stable (windows)	3m 32s
test-unstable (nightly)	49s
runtime-benchmarks (args_10_structs)	1m 31s
test-stable (macos)	1m 29s
runtime-benchmarks (args_10)	57s
typos	5s
runtime-benchmarks (args_20)	1m 8s
version-sync	7s
website-build	20s
	26m 8s

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