Produce CodeView info about nested types

If the DIE for a struct, class, or union contains a nested type, add a
LF_NESTTYPE entry to its field list recording this.

Plus if we use a nested type, make sure that its parent also gets
defined. This may entail adding a forward definition and creating a
deferred type, so we need to call flush_deferred_types in
codeview_debug_finish as well.

gcc/
	* dwarf2codeview.cc (enum cv_leaf_type): Add LF_NESTTYPE.
	(struct codeview_subtype): Add lf_nesttype to union.
	(flush_deferred_types): Add declaration.
	(write_lf_fieldlist): Handle LF_NESTTYPE.
	(codeview_debug_finish): Call flush_deferred_types.
	(add_struct_nested_type): New function.
	(get_type_num_struct): Call add_struct_nested_type, and if nested make
	that parent is added.

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