Rust

Get rid of an unnecessary vector allocation in `map_new_from_slices` #2768

Job	Run time
check-git-rev-deps	11s
cargo-deny (advisories)	4m 55s
fmt	8s
cargo-deny (bans licenses sources)	4m 3s
build-and-test (ubuntu-latest, wasm32-unknown-unknown, false)	9m 42s
publish-dry-run	0s
build-and-test (ubuntu-latest, x86_64-unknown-linux-gnu, true)	21m 55s
rust-analyzer-compat	3m 19s
complete	1s
	44m 14s

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