tree-ssa-phiopt.c (minmax_replacement): Create new ssa name if we're not the only contributor to target phi.

	* tree-ssa-phiopt.c (minmax_replacement): Create new ssa name if
	we're not the only contributor to target phi.

	testsuite/
	* c-c++-common/dfp/operator-comma.c: Call init function.
	* c-c++-common/dfp/convert-dfp-2.c: New test.

From-SVN: r226778