Slava Pestov 4f4e6f6ebf Sema: Remove another workaround and fuzz harder ...

We used to drop the entire generic parameter list if one of the
entries failed to parse. This caused a problem where the generic
parameters were still available for name lookup, so they had
to be special-cased since there's no generic environment set up
in this case.

Now, keep the parts of the generic parameter list around that
parsed successfully.

When I first made the change, almost a hundred crashers regressed;
now all the underlying issues have been fixed.

The result is that in addition to removing a crappy hack we get
some more mileage out of the compiler_crashers, because stuff like
this now builds a generic environment:

class S<T{...}

2017-02-03 17:02:04 -08:00

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