Inline the fast path of BitWriter::send_bits #1077

Job	Run time
QEMU build & test (stable, ubuntu-latest, s390x-unknown-linux-gnu, s390x-linux-gnu-gcc)	41s
cargo-c dynamic library	9s
Clippy	20s
QEMU build & test (stable, ubuntu-latest, i686-unknown-linux-gnu, i686-linux-gnu-gcc)	42s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	58s
Clippy (--no-default-features --features="c-allocator")	22s
Build and test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 1s
Clippy (--no-default-features --features="rust-allocator")	18s
Smoke-test fuzzing targets (default)	2m 30s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	58s
Smoke-test fuzzing targets (stable, macos-14, aarch64-apple-darwin)	2m 51s
Smoke-test fuzzing targets (c-allocator)	2m 38s
Build and test (stable, macos-latest, x86_64-apple-darwin)	1m 9s
Smoke-test fuzzing targets (rust-allocator)	2m 37s
vanilla dynamic library	13s
Build and test (stable, macos-14, aarch64-apple-darwin)	1m 11s
Miri	1m 48s
Build and test (stable-x86_64-gnu, windows-2022, x86_64-pc-windows-gnu)	2m 31s
run flate2 test suite	19s
wasm32	53s
	24m 9s

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