Mark the basic u8/u16/etc and LEB parser functions as inline
Mark the basic u8/u16/etc and LEB parser functions as inline

This produces a nice little speed up.

Before:

test bench_executing_line_number_programs      ... bench:     789,736 ns/iter (+/- 174,223)
test bench_parsing_debug_abbrev                ... bench:      29,954 ns/iter (+/- 5,563)
test bench_parsing_debug_info                  ... bench:   3,090,867 ns/iter (+/- 227,898)
test bench_parsing_line_number_program_opcodes ... bench:     645,258 ns/iter (+/- 42,596)

After:

test bench_executing_line_number_programs      ... bench:     659,758 ns/iter (+/- 19,789)
test bench_parsing_debug_abbrev                ... bench:      28,716 ns/iter (+/- 1,026)
test bench_parsing_debug_info                  ... bench:   3,039,127 ns/iter (+/- 53,674)
test bench_parsing_line_number_program_opcodes ... bench:     508,995 ns/iter (+/- 20,468)

gimli-rs/gimli,gimli-rs/gimli