6232870 MPSS does not work for x86 process stacks

[susan.scheuf...@sun.com]

Author: susans
Repository: /hg/onnv/onnv-gate
Revision: 4775824498f1089f25b26226132bd854d15a3273
Log message:
6232870 MPSS does not work for x86 process stacks

Files:
        update: usr/src/uts/common/syscall/memcntl.c