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Don't enter synthetic parameters of `applyOrElse` et al into
scope when typechecking the user-code; instead reference those
symbolically.
There is an exception to this principle. Currently we allow:
val x: PartialFunction[A, B] = x => x match { ... }
For this pattern of code, we use the given name `x` for the
corresponding method parameter of `applyOrElse` and `isDefinedAt`
and we actually need this to be in scope when we typecheck the
scrutinee. This construct is tested in `run/virtpatmat_partial.scala`.
A new parameter, `paramSynthetic`, differentiates this
case from the more typical `val x: PF[A, B] = { case ... => ... ; ... }
case, which uses a fresh name need not be in scope. (We could get
away with it, as it is fresh, but I thought it better to exclude it.)
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