Robustly identify unpickling the current module class

When unpickling a class, if the name and owner matches the current
`classRoot` of the unpickling Scan, that `classRoot` symbol is used
instead of creating a new symbol.

If, in addition, the class being unpickled has the MODULE flag, the
unpickler should use the `moduleRoot.moduleClass` symbol (instead of
creating a new one).

To identify the module class, the current implementation compares the
name and owner to the `classRoot`. This fails in case the `classRoot`
is `NoSymbol`, which can happen in corner cases (when a type alias
shadows a class symbol, scala-dev#248).

In this patch we identify the module class by comparing the name and
owner to the `moduleRoot` symbol directly (using a `toTypeName`).

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