tree-object-size.c: Remove builtins.h include, include tree-cfg.h.

tree-object-size.c: Remove builtins.h include, include tree-cfg.h.

2015-10-26  Richard Biener  <rguenther@suse.de>

	* tree-object-size.c: Remove builtins.h include, include tree-cfg.h.
	(do_valueize): New function.
	(pass_object_sizes::execute): Use gimple_fold_stmt_to_constant and
	replace_uses_by.
	* tree-ssa-threadedge.c: Remove builtins.h include, include
	gimple-fold.h
	(fold_assignment_stmt): Remove.
	(threadedge_valueize): New function.
	(record_temporary_equivalences_from_stmts): Use
	gimple_fold_stmt_to_constant_1, note additional cleanup
	opportunities.

From-SVN: r229364