Optimize LEB128 data reading #1859

Job	Run time
Build using minimum versions of dependencies	40s
Benchmark	0s
Build [ubuntu-latest, stable, dev, --workspace --exclude=gsym-in-apk]	47s
Cross-compile [aarch64-linux-android]	1m 28s
Check generated C header	24s
Build [ubuntu-latest, stable, release, --workspace --exclude=gsym-in-apk]	1m 7s
Generate documentation	57s
Cross-compile [arm-linux-androideabi]	1m 24s
Build [macos-latest, stable, dev, --workspace --exclude=gsym-in-apk]	29s
Cross-compile [armv7-linux-androideabi]	1m 19s
Build [macos-latest, stable, release, --workspace --exclude=gsym-in-apk]	1m 32s
No-op rebuilds	1m 7s
Cross-compile [x86_64-unknown-linux-musl]	18s
Lint with clippy	1m 13s
Build [ubuntu-latest, stable, dev, --lib --no-default-features]	13s
Build [ubuntu-latest, stable, dev, --lib --no-default-features --features=apk]	40s
Check code formatting	14s
Test and coverage	2m 4s
Build [ubuntu-latest, stable, dev, --lib --no-default-features --features=breakpad]	14s
Test examples	1m 25s
Build [ubuntu-latest, stable, dev, --lib --no-default-features --features=gsym]	16s
Test with Miri	1m 59s
Test with release build	3m 12s
Test with address sanitizer	1m 0s
Build [ubuntu-latest, stable, dev, --lib --no-default-features --features=zlib]	34s
Test with leak sanitizer	49s
Build [ubuntu-latest, stable, dev, --lib --no-default-features --features=zstd]	13s
Build [ubuntu-latest, stable, dev, --package=blazecli]	27s
Build [ubuntu-latest, stable, dev, --package=blazesym-c]	17s
	26m 22s

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