* Add encodings for i8 and i16 copy, spill, fill, ireduce.i8.i16
Also adds legalization for srem, irsub_imm, {u,s}extend.i16.i8
Fixes #477 cc #466
* Legalize popcnt, clz and ctz for i8 and i16
* Fix bug in call_memset
This crate contains the core Cranelift code generator. It translates code from an intermediate representation into executable machine code.