re PR tree-optimization/90037 (-Wnull-dereference false positive after r269302)

re PR tree-optimization/90037 (-Wnull-dereference false positive after r269302)

	PR tree-optimization/90037
	* Makefile.in (OBJS): Remove tree-ssa-phionlycprop.c
	* passes.def: Replace all instance of phi-only cprop with the
	lattice propagator.  Move propagation pass from after erroneous
	path isolation to before erroneous path isolation.
	* tree-ssa-phionlycprop.c: Remove.

	* gcc.dg/tree-ssa/20030710-1.c: Update dump file to scan.
	* gcc.dg/isolate-2.c: Likewise.
	* gcc.dg/isolate-4.c: Likewise.
	* gcc.dg/pr19431.c: Accept either ordering of PHI args.
	* gcc.dg/pr90037.c: New test.

From-SVN: r270574