[8u20] RFR (XS): 8022070: Compilation error in stubGenerator_sparc.cpp with some compilers

[Mikael Vidstedt]

Please review this 8u20 backport request. The fix was pushed to jdk9 a 
few weeks ago and has not shown any problems.

The change from jdk9 applies to jdk8u/hs-dev without conflicts.

Webrev: 
http://cr.openjdk.java.net/~mikael/webrevs/8022070-8uhsdev/webrev.00/webrev/
Bug: https://bugs.openjdk.java.net/browse/JDK-8022070
jdk9 change: 
http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/e3a56821c4e3

Thanks,
Mikael