re PR testsuite/32076 ("gcc.dg/tree-ssa/pr17141-1.c scan-tree-dump locp.*->i =" is the same name twice)

	PR testsuite/32076
	* lib/scandump.exp (dump-suffix): New.
	(scan-dump, scan-dump-times, scan-dump-dem, scan-dump-dem-not):
	Include dump suffix in pass/fail messages, put regexp in quotes.

From-SVN: r129858