[cfe-dev] Patch for enum sizes

[Keith Bauer]

Well, a start, anyway.  Enough to prevent clang asserting when
switching on an enumerated type, at least.

No idea if this is a sensible approach or not.  Feel free to flame ;)

I think the code dealing with finding the minimum and maximum enum
constants is really ugly, but I can't see a better way to do it with
the current APSInt API.  Anyone have ideas?

-Keith
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