* Makefile.in (tree-ssa-phiopt.o): Depends on flags.h.
        * tree-ssa-phiopt.c: Include flags.h.
        (conditional_replacement): Remove argument names from prototype.
        Minor formatting and comment fixes.
        (tree_ssa_phiopt): If conditional_replacement returns false, then
        call value_replacement.
        (value_replacement): New function.

        * gcc.dg/tree-ssa/20040518-1.c: New test.

Co-Authored-By: Jeff Law <law@redhat.com>

From-SVN: r81999