2009-04-17  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-dom.c (gimple_assign_unary_useless_conversion_p): Remove.
	(record_equivalences_from_stmt): Remove useless checks and
	simplifications.
	* tree-ssa-pre.c (eliminate): Avoid converting a constant if
	the type is already suitable.

From-SVN: r146260