libclang: binary/unary operator spelling

[Markus Lottmann via cfe-commits]

Hello,

this is my first patch proposal so please for give me if i made some 
mistakes.

This patch changes the result of clang_getCursorSpelling in the way that 
it returns the operator for 
CXCursor_BinaryOperator/CXCursor_UnaryOperator instead of an empty string.
So e.g. for a + b it returns: +

I would like to know if such a change is welcome or if maybe the
current behavior is intended in a way i failed to perceive.

If yes i would provide a patch which also includes updated tests.

Best Regards,
Markus Lottmann
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