Add syscall suport for system calls sys_mbind, sys_set_mempolicy and
sys_get_mempolicy.

This patch add support for the PPC64 sytem calls:
        259 - sys_mbind
	260 - sys_get_mempolicy
	261 - sys_set_mempolicy

This patch also adds the Add syscall 259, sys_mbind, support for the PPC32
platform.

The patch fixes bugzilla 318932.

Signed-off-by: Carl Love <cel@us.ibm.com>
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git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13383 a5019735-40e9-0310-863c-91ae7b9d1cf9