2012-12-19  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/55736
	PR tree-optimization/55703
	* gimplify.c (prune_expr_location): New function.
	(unshare_expr_without_location): Likewise.
	* tree.h (unshare_expr_without_location): Declare.
	* ipa-prop.c (prune_expression_for_jf): Remove.
	(prune_expression_for_jf_1): Likewise.
	(ipa_set_jf_constant): Use unshare_expr_without_location.
	(ipa_set_jf_arith_pass_through): Likewise.
	(determine_known_aggregate_parts): Likewise.
	* tree-switch-conversion.c (build_constructors): Use
	unshare_expr_without_location on all constructor elements.

	* gcc.dg/lto/pr55703_0.c: New testcase.

From-SVN: r194609