[PATCH] [Support] Make GetMallocUsage() aware of jemalloc

[David Majnemer]

In http://reviews.llvm.org/D7663#125254, @davide wrote:

> I do agree with you and I'm generally a big fan of avoiding 'else' unless necessary but a couple of lines below that if/else is used so I'd keep that for consistency and (eventually) change in a subsequent commit, in order to not mix style/functional modifications.
>  Does this make sense to you?


Makes sense.


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http://reviews.llvm.org/D7663

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