netfilter : add xt_quota2, xt_qtaguid

Conflicts:
	include/net/netfilter/nf_tproxy_core.h
	net/netfilter/xt_qtaguid.c
	net/netfilter/xt_qtaguid_internal.h
ARM: improve compiler's ability to optimize page tables

Allow the compiler to better optimize the page table walking code
by avoiding over-complex pmd_addr_end() calculations.  These
calculations prevent the compiler spotting that we'll never iterate
over the PMD table, causing it to create double nested loops where
a single loop will do.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>