Rewrites the char_to_escaped_literal and bytes_to_escaped_literal
functions in a way that minimizes heap allocations. After this, the
resulting string is the only allocation remaining.
I believe when this code was originally written, the routines available
to avoid heap allocations didn't exist.
I'm skeptical that this matters in the grand scheme of things, but I
think this is still worth doing for "good sense" reasons.
PR #2833
c9ebcbd8ab