re PR c/77946 (-Wimplicit-fallthrough=1 ICE: tree check: expected tree that contains ‘decl with visibility’ structure, have ‘label_decl’)

	PR c/77946
	* tree.h (FALLTHROUGH_LABEL_P): Use private_flag instead of
	public_flag.
	* varasm.c (default_binds_local_p_3): Formatting fix.

	* c-c++-common/Wimplicit-fallthrough-34.c: New test.

From-SVN: r241094