[CVE-2011-0726] proc: protect mm start_code/end_code in /proc/pid/stat

[Andy Whitcroft]

CVE-2011-0726
	ASLR leak in /proc/pid/stat for mm start_code

This has hit Lucid and later via mainline/upstream stable.  This needed
for Hardy, Lucid/fsl-imx51, and Maverick/ti-omap4.  Note that for Hardy
an additional pre-requisite commit is required which also seems to fix
a number of related ASLR leaks in the same file.

Proposing for Hardy, Lucid/fsl-im51, and Maverick/ti-omap4.

-apw