* tree-vrp.c (set_value_range_to_nonnegative): New function.
(vrp_expr_computes_nonnegative, ssa_name_nonnegative_p): Likewise.
(ssa_name_nonzero_p): Likewise.
(get_value_range): Return NULL if VRP is not running.
(extract_range_from_expr): Fallback to tree_expr_XXX_p if
VRP routines do not discover a range.
(vrp_finalize): Clear VR_VALUE to indicate VRP is not running.
* tree.h (ssa_name_nonzero_p, ssa_name_nonnegative_p): Prototype.
* fold-const.c (tree_expr_nonzero_p): For SSA_NAMEs, query VRP.
(tree_expr_nonnegative_p): Similarly.
* tree-ssa-dom.c (nonzero_vars, nonzero_vars_stack): Remove.
(restore_nonzero_vars_to_original_value): Remove.
(unsafe_associative_fp_binop): Remove.
(tree_ssa_dominator_optimize): Remove initialization and
finalization of nonzero_vars and nonzero_vars_stack.
(dom_opt_initialize_block): No longer push marker on
nonzero_vars_stack.
(dom_opt_finalize_block): No longer call
restore_nonzero_vars_to_original_value.
(record_equivalences_from_phis): No longer look for
nonzero PHI arguments.
(cprop_into_successor_phis): No longer propagate nonzero
property into PHI arguments. Lose unused argument. Caller
updated.
(record_equivalences_from_stmt): No longer record nonzero
values for SSA_NAMEs.
(lookup_avail_expr): No longer use nonzero_vars.
* gcc.dg/tree-ssa/vrp24.c: Update expected output.
* gcc.dg/tree-ssa/vrp26.c: New test.
From-SVN: r111175
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