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Nicholas Nethercote
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I don't know why `SmallStr` was used here; some ad hoc profiling showed this code is not that hot, the string is usually empty, and when it's not empty it's usually very short. However, the use of a `SmallStr<1024>` does result in 1024 byte `memcpy` call on each execution, which shows up when I do `memcpy` profiling. So using a normal string makes the code both simpler and very slightly faster.
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.