[llvm] r176214 - The FastISEL should be fast. But when we record statistics we use atomic operations to increment the counters.

[Eric Christopher]

> This patch disables the counters on non-debug builds. This reduces the
> runtime of SelectionDAGISel::SelectCodeCommon by ~5%.
>

Hey, good idea. Wonder if we should do this in general and make statistics
gathering dependent upon NDEBUG?


> -      unsigned NumFastIselRemaining = std::distance(Begin, End);
> +      unsigned NumFastIselRemaining = 0;
> +      NumFastIselRemaining = std::distance(Begin, End);
>

Eh?

-eric
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