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`getClass` is special cased in the compiler; this is described
in in the comments on `Definitions.Any_getClass`.
Part of this happens in `Typer#stabilize`. This was trying to determine
if an Ident or Select node was a call to `getClass` by merits of the name
of the tree's symbol and by checking that the its type (if it was a
MethodType or PolyType) had no parameters in the primary parameter list.
Overloaded user defined `getClass` methods confused this check. In the
enclosed test case, the tree `definitions.this.getClass` had an
`OverloadedType`, and such types always report an empty list of `params`.
This commit:
- changes `stabilize` to use `isGetClass`, rather than the
homebrew check
- changes `isGetClass` to consider a `Set[Symbol]` containing all
`getClass` variants. This moves some similar code from `Erasure`
to `Definitions`
- keeps a fast negative path in `isGetClass` based on the symbol's name
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