9e088e4164
This patch: * removes the "default" opt level, on the basis that it has no definition and is referred to nowhere in the compiler. * renames the "fastest" level to "none". The resulting set of transformations is unchanged. * renames the "best" level to "speed_and_size". The resulting set of transformations is unchanged. * adds a new level, "speed". This is the same as "speed_and_size" except that it omits transformations aimed only at reducing code size. Currently it omits only the insn shrinking pass.
This crate contains the core Cranelift code generator. It translates code from an intermediate representation into executable machine code.