re PR c/22013 (ICE in gimple_add_tmp_var, at gimplify.c:535)

	PR c/22013
	PR c/22098
	* langhooks.h (struct lang_hooks): Add expr_to_decl.
	* langhooks.c (lhd_expr_to_decl): New.
	* langhooks-def.h (lhd_expr_to_decl, LANG_HOOKS_EXPR_TO_DECL):
	New.
	(LANG_HOOKS_INITIALIZER): Update.
	* tree.c (recompute_tree_invarant_for_addr_expr): Call
	expr_to_decl langhook.
	* c-tree.h (c_expr_to_decl): Declare.
	* c-typeck.c (c_expr_to_decl): New.
	(build_unary_op): Do not handle ADDR_EXPR of COMPOUND_LITERAL_EXPR
	specially.
	* c-objc-common.h (LANG_HOOKS_EXPR_TO_DECL): Define.

testsuite:
	* gcc.c-torture/compile/pr22013-1.c,
	gcc.c-torture/execute/pr22098-1.c,
	gcc.c-torture/execute/pr22098-2.c,
	gcc.c-torture/execute/pr22098-3.c: New tests.

From-SVN: r101630