* cp-tree.h (function_depth): Declare.
	(verify_stmt_tree): Likewise.
	(find_tree): Likewise.
	* decl.c (function_depth): Give it external linkage.
	* optimize.c (optimize_function): Increment and decrement it.
	* tree.c (verify_stmt_tree_r): New function.
	(verify_stmt_tree): Likewise.
	(find_tree_r): Likewise.
	(find_tree): Likewise.

From-SVN: r35301