[8u] RFR for backport of JDK-8148175: C1: G1 barriers don't preserve FP registers to jdk8u-dev

[Muthusamy Chinnathambi]

Hi,
		 
Please review the backport of bug: "JDK-8148175: C1: G1 barriers don't preserve FP registers" to jdk8u-dev

Please note that this is not a clean backport due to new entries in TEST.groups and copyright changes.

Webrev: http://cr.openjdk.java.net/~mchinnathamb/8148175/webrev.00/
jdk9 bug: https://bugs.openjdk.java.net/browse/JDK-8148175 
Original patch pushed to jdk9: http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/a9334e785873 

Test:  Run jtreg and jprt hotspot testsets.

Regards,
Muthusamy C