RFR 8078563 - add profitability tests for reductions

[Berg, Michael C]

Hi Folks,

We (Intel) would like to add profitability tests to superword to gate scenarios where reduction optimization overhead is roughly equal to the benefit gained by vectorization.

We would like to do this for all x86 enabled microarchitectures that support reductions and superword.  This new constraint was tested on SSE and AVX (1,2) enabled platforms.
The contribution as referenced by RFR 8078563 is defined by the information at the links below.

Please review this bug entry and its code and comment as needed:

https://bugs.openjdk.java.net/browse/JDK-8078563



And its code and test addition (this is a small patch):



http://cr.openjdk.java.net/~kvn/8078563/webrev/


Vladimir Koslov has offered to sponsor this patch.

Thanks,
Michael
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