[PATCH] Basic reform of chunks for overload completion results.

[Francisco Lopes da Silva]

@klimek The client code has opportunity to better highlight individual tokens and warn the user what parameters are required and what aren't. Although the Russian nesting doll approach to optionals may turn the treatment slightly more complex, but it's the approach already employed elsewhere in the codebase as in `AddFunctionParameterChunks`.


http://reviews.llvm.org/D7152

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