[cfe-dev] Improving source type info for typeof nodes.

[Enea Zaffanella]

Hello.

Please find attached a patch for improving the type source info 
available for TypeOfExprType and TypeOfType nodes.

The augmented TypeOf(Expr)TypeLoc nodes provide info about:
   - the location of the typeof keyword;
   - the locations of the left&right parentheses (may be invalid);
   - the source range for the whole typeof construct;
   - source type info for the underlying type (for TypeOfType nodes).

The patch passes all clang tests.

Cheers,
Enea Zaffanella.
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