Compress an identifier for name mangling purposes. Format is if ASCII, then it's just the char. If high bit set, then it's a length/offset pair
string to compress
length of id
where to store length of compressed result
malloc'd compressed 0-terminated identifier
See Implementation
Compress an identifier for name mangling purposes. Format is if ASCII, then it's just the char. If high bit set, then it's a length/offset pair