re PR c++/60553 (segfault in gt_ggc_mx_lang_tree_node in Chromium with LTO)

2014-03-19  Richard Biener  <rguenther@suse.de>

	PR middle-end/60553
	* tree-core.h (tree_type_common): Re-order pointer members
	to reduce recursion depth during GC walks.

	lto/
	* lto-tree.h (lang_tree_node): For types use TYPE_NEXT_VARIANT 
	instead of TREE_CHAIN as chain_next.

From-SVN: r208682