[dev.regabi] cmd/compile: update ir/fmt for concrete types
An automated rewrite will add concrete type assertions after
a test of n.Op(), when n can be safely type-asserted
(meaning, n is not reassigned a different type, n is not reassigned
and then used outside the scope of the type assertion,
and so on).
This sequence of CLs handles the code that the automated
rewrite does not: adding specific types to function arguments,
adjusting code not to call n.Left() etc when n may have multiple
representations, and so on.
This CL handles package fmt. There are various type assertions
but also some rewriting to lean more heavily on reflection.