Merged / updated old alias.c patch; current testcase is
gcc.dg/torture/stackalign/vararg-1.c  -O2
(and higher optimization levels, too).

(orig date 2009-09-23)
2013-07-30  Joern Rennecke <joern.rennecke@embecosm.com>

        * alias.c (base_alias_check): Allow for aliases between stack-
        and frame-pointer referenced memory.

git-svn-id: svn+ssh://thomas.embecosm.com/embecosm/Customer-Projects/adapteva/branches/epiphany-20120120@2349 8ad889b4-764b-0410-b193-d8a7b30fb157

Conflicts:
	gcc/ChangeLog.epiphany
	gcc/alias.c