re PR c++/80135 (ICE in output_constructor_regular_field, at varasm.c:4968)

re PR c++/80135 (ICE in output_constructor_regular_field, at varasm.c:4968)

	PR c++/80135
	PR c++/81922
	* typeck2.c (digest_init_r): Change nested argument type from bool to
	int.  Use code instead of TREE_CODE (type) where possible.  If
	nested == 2, diagnose initialization of flexible array member with
	STRING_CST.  Pass nested to process_init_constructor.  Formatting fix.
	(digest_init, digest_init_flags): Adjust digest_init_r caller.
	(massage_init_elt): Add nested argument.  Pass 2 instead of 1 to
	digest_init_r's nested argument if nested is non-zero.
	(process_init_constructor_array): Add nested argument.  If nested == 2,
	diagnose initialization of flexible array member with non-empty
	braced enclosed list.  Pass nested to massage_init_elt.
	(process_init_constructor_record, process_init_constructor_union): Add
	nested argument, pass it to massage_init_elt.
	(process_init_constructor): Add nested argument, pass it to
	process_init_constructor_{array,record,union}.
	* init.c (find_field_init): Renamed to ...
	(find_flexarray_init): ... this.  Return NULL_TREE if init is
	error_mark_node.  Don't look through nested CONSTRUCTORs.
	(warn_placement_new_too_small): Adjust caller.

	* g++.dg/warn/Wplacement-new-size-1.C (fBx1): Initialize nested
	flexible array member only with {}.  Add dg-warning.
	(fBx2, fBx3): Remove.
	* g++.dg/warn/Wplacement-new-size-2.C (fBx1): Initialize nested
	flexible array member only with {}.  Add dg-warning.
	(fBx2, fBx3): Remove.
	* g++.dg/warn/Wplacement-new-size-6.C: New test.
	* g++.dg/ext/flexary13.C (main): Remove test for initialization
	of nested flexible array member with non-empty initializer.
	* g++.dg/ext/flexary25.C: New test.
	* g++.dg/ext/flexary26.C: New test.
	* g++.dg/ext/flexary27.C: New test.
	* g++.dg/parse/pr43765.C: Expect diagnostics about initialization
	of nested flexible array member with non-empty initializer.  Expect
	C++2A diagnostics about mixing of designated and non-designated
	initializers.

From-SVN: r255703