The interface lowering pass used a separate formatter for method
signatures. Same-named local aliases could therefore make distinct generic
methods compare equal. Reuse getTypeCodeName so interface checks preserve
type identity.
x/tools SSA names and go/types strings can preserve the source spelling of
type arguments, so aliases can make distinct instances collide. Use the
canonical type encoding for function names, synthetic local type owners,
instantiated named types, and method sets.
Add cases where same-named local aliases instantiate generic functions,
local types, and methods with float32 and float64. Record the current
collisions and incorrect results.
* compiler: make getTypeCodeName a method on compilerContext
* testdata: add regression tests for function-local named types
* compiler: disambiguate function-local named types
* Some PR feedback
Jake Bailey