Minor improvements to `All` and `Any` adapters #2319

Job	Run time
cargo +1.36 build (futures-{core, io, sink})	1m 9s
cargo test (ubuntu-latest)	1m 5s
cargo test (macos-latest)	1m 5s
cargo +1.56 build	1m 9s
cargo +stable build	1m 9s
cargo +beta build	1m 4s
cargo test (windows-latest)	1m 1s
cargo +nightly build	1m 6s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	58s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	1m 9s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	1m 4s
cargo bench	1m 6s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	1m 6s
cargo clippy	36s
codegen	32s
cargo doc	27s
cargo hack check --feature-powerset	1m 6s
cargo fmt	9s
cargo minimal-versions build	39s
cargo miri test	1m 7s
cargo build --target thumbv7m-none-eabi	39s
cargo test -Z sanitizer=address	1m 5s
cargo build --target thumbv6m-none-eabi	39s
cargo test -Z sanitizer=memory	1m 5s
cargo test -Z sanitizer=thread	1m 5s
	23m 20s

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