2018-10-23  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/87105
	PR tree-optimization/87608
	* passes.def (pass_all_early_optimizations): Add early phi-opt
	after dce.
	* tree-ssa-phiopt.c (value_replacement): Ignore NOPs and predicts in
	addition to debug stmts.
	(tree_ssa_phiopt_worker): Add early_p argument, do only min/max
	and abs replacement early.
	* tree-cfg.c (gimple_empty_block_p): Likewise.

	* g++.dg/tree-ssa/phiopt-1.C: New testcase.
	g++.dg/vect/slp-pr87105.cc: Likewise.
	* g++.dg/tree-ssa/pr21463.C: Scan phiopt2 because this testcase
	relies on phiprop run before.
	* g++.dg/tree-ssa/pr30738.C: Likewise.
	* g++.dg/tree-ssa/pr57380.C: Likewise.
	* gcc.dg/tree-ssa/pr84859.c: Likewise.
	* gcc.dg/tree-ssa/pr45397.c: Scan phiopt2 because phiopt1 is
	confused by copies in the IL left by EVRP.
	* gcc.dg/tree-ssa/phi-opt-5.c: Likewise, this time confused
	by predictors.
	* gcc.dg/tree-ssa/phi-opt-12.c: Scan phiopt2.
	* gcc.dg/pr24574.c: Likewise.
	* g++.dg/tree-ssa/pr86544.C: Scan phiopt4.

From-SVN: r265421