* ssa-ccp.c (first_phi_node): Remove.  Replace uses with calls to
        first_insn_after_basic_block_note instead.

        * df.c (df_bb_refs_unlink): #if 0 out for now.

        * ssa.h: Add prototype for ssa_const_prop
        * ssa-ccp.c: Add prototype for ssa_fast_dce and mark_references
        (ssa_ccp_substitute_constants): Fix signed vs unsigned comparison
        (ssa_fast_dce): Remove unused variable

From-SVN: r43906