[9] Review request for 8171393: Integrate precision fixes for Marlin

[Jim Graham]

Laurent sent these webrevs to Kevin and I earlier to evaluate for JDK9.  We're testing them and planning to integrate 
them so I thought I should send out the official review request, though it is really Laurent's work and he'll be the 
eventual author listed on the changeset:

JBS: https://bugs.openjdk.java.net/browse/JDK-8171393
webrev: http://cr.openjdk.java.net/~lbourges/marlinFX-D/marlinFX-Double-raw.1/

webrev to compare against the float code to see how the double variant differs:
http://cr.openjdk.java.net/~lbourges/marlinFX-D/marlinFX-Double-cmp.1/

				...jim