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In code like
namespace ns {
static int const C = 0;
void f(int = C);
}
we previously generated `default="C"` for the default argument of `f`
because Clang prints the expression as it was written in the source.
GCC-XML would generate the fully qualified name `default="ns::C"`
which is more useful to tools reading the output. Update our default
argument printing to do this by hooking in to Clang's pretty printer
and providing a custom implementation for `DeclRefExpr`.
GitHub-Issue: CastXML/CastXML#51
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