line: Force inlining of OpcodesIter::next_opcode()
line: Force inlining of OpcodesIter::next_opcode()

Before:
test bench_executing_line_number_programs      ... bench: 379,536 ns/iter (+/- 12,044)
test bench_parsing_line_number_program_opcodes ... bench: 271,593 ns/iter (+/- 9,285)

After:
test bench_executing_line_number_programs      ... bench: 246,375 ns/iter (+/- 11,192)
test bench_parsing_line_number_program_opcodes ... bench:  90,493 ns/iter (+/- 2,722)

gimli-rs/gimli,gimli-rs/gimli