[cfe-dev] Fixup throw parsing

[Mike Stump]

This fixes one last case of throw parsing and cleans up throw; parsing  
to be better.  I do the first by rotating in the throw parsing into  
ParseCastExpression as the way the code is written currently, it  
really wants to handle all the leaf things in that routine.  I  
preserve that and extend that.  I don't quite know if I like that  
design, but, I'll offer this version of the code.  I could equally  
just add the:

  if (Tok.is(tok::kw_throw))
     LHS = ParseThrowExpression();

style code to the few other places that need it.  What do people think  
is better?


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