* tree-ssa-ccp.c (fold_stmt_r): DATA argument is now a pointer

	* tree-ssa-ccp.c (fold_stmt_r): DATA argument is now a pointer
	to a structure containing state rather than a pointer to bool.
	(case ARRAY_REF): New code to handle folding some array references.
	(case ADDR_EXPR): Note when we are processing expressions found
	within an ADDRE_EXPR.
	(fold_stmt, fold_stmt_inplace): Pass in a structure to fold_stmt_r
	for state variables rather than just a pointer to a boolean.
	* tree-ssa-dom.c (simplify_rhs_and_lookup_avail_expr): Remove
	handling of constant string references.

	* gcc.dg/tree-ssa/foldstring-1.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@108519 138bc75d-0d04-0410-961f-82ee72b054a4