RFR: 8202366,,Add macro for common loop in GCConfig

[Aleksey Shipilev]

On 04/27/2018 11:42 AM, Per Liden wrote:
> In GCConfig, we loop over the list of supported GCs in many places. We could simplify the code a bit
> by adding a FOR_EACH_SUPPORTED_GC macro.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8202366
> Webrev: http://cr.openjdk.java.net/~pliden/8202366/webrev.0

Looks good (well, as good as control-flow-bearing macros look).

-Aleksey

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