[PATCH] Implementation for completion in call context for C++

[Francisco Lopes da Silva]

In http://reviews.llvm.org/D6880#109513, @francisco.lopes wrote:

> Refactoring
>
> - Followed all points by Manuel Klimek except for the one targeting `suppressDiagnostics()`.


Looking elsewhere and in docs, it seems `suppressDiagnostics()` is better to be used since diagnostics in lookups just for completion are not expected.


http://reviews.llvm.org/D6880

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