* hooks.c (hook_bool_void_true): New function.
	* hooks.h (hook_bool_void_true): Declare.
	* target-def.h (TARGET_CXX): Add
	TARGET_CXX_KEY_METHOD_MAY_BE_INLINE.
	* target.h (struct cxx): Add key_method_may_be_inline.
	* config/arm/arm.c (arm_cxx_key_method_may_be_inline): New
	function.
	(TARGET_CXX_KEY_METHOD_MAY_BE_INLINE): New macro.
	* config/arm/bpabi.h: Use __THUMB_INTERWORK__ instead of
	__THUMB_INTERWORK.

 	* class.c (key_method): Rename to ...
	(determine_key_method): ... this.
	(finish_struct_1): Adjust accordingly.
	* cp-tree.h (key_method): Declare.
	* decl2.c (maybe_emit_vtables): Determine the key method here if
	it has not already been done.

	* g++.dg/abi/key1.C: New test.

From-SVN: r86843