RFR (XS) 8139086: Solaris/Sparc slowdebug build fails for memset_with_concurrent_readers.cpp

[Mikael Gerdin]

Hi all,

We recently discovered that slowdebug builds fail on Solaris/SPARC due 
to an issue with inline assembly in memset_with_concurrent_readers_sparc.cpp

After discussions with the C++ compiler team at Oracle it was pointed 
out to us that the code was incorrect in that it had too few %'s.

Actual registers referenced by name must be escaped with %% but it 
appears that enabling optimization in the Studio compiler disregards 
that requirement.

Bug: https://bugs.openjdk.java.net/browse/JDK-8139086
Webrev: http://cr.openjdk.java.net/~mgerdin/8139086/webrev/

Testing: Building product|fastdebug|slowdebug on Solaris/SPARC.

Thanks
/Mikael