[llvm] r194486 - Revert "Remove unused variable."

[Rafael Espíndola]

>> I was thinking of something like "don't warn if the variable is
>> defined inside a macro".
>>
>
> Ah, right, I see - yes, this is a common problem with -Wunused (expressions,
> functions, variables, and even dead-code) warnings. The suppressions in
> Clang for cases like these have been added somewhat ad-hoc-ly and are
> inconsistent over the different cases. It might be worth tidying them all up
> and taking a general approach.

Turns out this is a more basic clang bug and not macro related:

http://llvm.org/bugs/show_bug.cgi?id=17897


Cheers,
Rafael