performance-tuning === vs _Utils_eq

[decioferreira]

A suggestion by @miniBill that we should consider:

one suggestion from performance-tuning some elm code recently: double check that if you're doing x == 'c' that the compiler generates === and not _Utils_eq. I was able to make elm-xml-parser something like 3x faster on a real RSS feed

This should both be considered in context to the compiler code, as well as for considering improvements on the generated guida compiler code.