RFR: 8202548: Use reservation Object when creating SpeciesData

[Claes Redestad]

Hi,

a small follow-up to JDK-8202184 in line with Peter Levart's suggestion, 
where we can avoid
instantiating two different SpeciesData objects, and should avoid 
creating an instance of
the Function on each lookup:

Webrev: http://cr.openjdk.java.net/~redestad/8202548/open.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8202548

This is a small micro-optimization, as well as granting more freedom to 
future newSpeciesData
implementations.

Thanks!

/Claes