PROBLEM:
There is a small ommission in parser.y, which will lead
to syntax errors in cases when non-empty throw declaration is
followed by `override`, `final` or both. E.g. in cases like:
void finalOverriden() throw(std::exception) final override;
SOLUTION:
- Add a `THROW LPAREN parms RPAREN virt_specifier_seq` to
exception_specification in Source/CParse/parser.y
- Add several methods in test-suite/cpp11_final_override.i
to verify the fix works.
