re PR middle-end/65984 (ICE: definition in block 4 does not dominate use in block 2 with -fnon-call-exceptions -fsanitize=enum)

	PR tree-optimization/65984
	* ubsan.c: Include tree-cfg.h.
	(instrument_bool_enum_load): Use stmt_ends_bb_p instead of
	stmt_could_throw_p test, rename can_throw variable to ends_bb.

	* c-c++-common/ubsan/pr65984.c: New test.

From-SVN: r222775