RFR (S) 8023956: Provide a work-around to broken Linux 32 bit "Exec Shield" using CS for NX emulation (crashing with SI_KERNEL)

[David Simms]

G'day all,

Please review a small enhancement for working around a rare but annoying 
Linux bug (ia32 only).

Bug link: https://bugs.openjdk.java.net/browse/JDK-8023956 ( 
http://bugs.sun.com/view_bug.do?bug_id=8023956)

Webrev: http://cr.openjdk.java.net/~dsimms/8023956/ 
<http://cr.openjdk.java.net/%7Edsimms/8023956/>

Cheers
/David Simms
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