re PR c++/6994 (ICE in find_function_data)

re PR c++/6994 (ICE in find_function_data)

	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. #undef WALK_SUBTREE_TAIL at end.
	(copy_tree_r): Copy types if they are variably modified.

	* hooks.c (hook_tree_bool_false): New.
	* hooks.h: Prototype it.
	* langhooks.h (struct lang_hooks_for_tree_inlining): Add
	var_mod_type_p.
	* langhooks-def.h: Default for tree_inlining.var_mod_type_p is
	hook_tree_bool_false.

	* tree.c (variably_modified_type_p): Moved here from
	cp/tree.c.  Use lang_hooks.tree_inlining.var_mod_type_p for
	language-specific cases.  Due to this, must weaken some 'if
	and only if' checks to merely 'if'.
	* tree.h: Prototype variably_modified_type_p.

cp:
	* cp-lang.c (cp_var_mod_type_p): New: C++ hook for
	variably_modified_type_p.
	* cp-tree.h: Remove prototype of variably_modified_type_p.
	* tree.c (variably_modified_type_p): Remove; now implemented
	in language-independent code.

	PR c++/7266
	* decl.c (grokdeclarator): Check that TREE_OPERAND 0 of a
	SCOPE_REF is not null before dereferencing it.

testsuite:
	* g++.dg/ext/vla1.C, gcc.dg/vla-2.c,
	g++.dg/template/typename3.C: New tests.

From-SVN: r58542