PR middle-end/6994

	* c-objc-common.c (inline_forbidden_p): Can not inline
	functions containing structures or unions containing VLAs.
	* tree-inline.c (walk_tree): For all class 't' nodes, walk
	TYPE_SIZE and TYPE_SIZE_UNIT.
	(copy_tree_r): Copy types if they are variably modified.

	* g++.dg/ext/vla1.C, gcc.dg/vla-2.c: New tests.

From-SVN: r58535