match.pd: Add two abs patterns.

match.pd: Add two abs patterns.

2014-11-03  Richard Biener  <rguenther@suse.de>

	* match.pd: Add two abs patterns.  Announce tree_expr_nonnegative_p.
	Also drop bogus FLOAT_EXPR and FIX_TRUNC_EXPR.
	* fold-const.c (fold_unary_loc): Remove them here.
	(tree_unary_nonnegative_warnv_p): Use CASE_CONVERT.
	* gimple-fold.c (fold_gimple_assign): Remove now obsolete
	GIMPLE_UNARY_RHS case.
	(gimple_fold_stmt_to_constant_1): Likewise.
	(replace_stmt_with_simplification): Fix inverted comparison.

From-SVN: r217039