re PR sanitizer/80110 (error: statement marked for throw, but doesn’t w/ -fsanitize...

re PR sanitizer/80110 (error: statement marked for throw, but doesn’t w/ -fsanitize=thread)

	PR sanitizer/80110
	* tsan.c: Include tree-eh.h.
	(instrument_builtin_call): Call maybe_clean_eh_stmt or
	maybe_clean_or_replace_eh_stmt where needed.
	(instrument_memory_accesses): Add cfg_changed argument.
	Call gimple_purge_dead_eh_edges on each block and set *cfg_changed
	if it returned true.
	(tsan_pass): Adjust caller.  Return TODO_cleanup_cfg if cfg_changed.

	* g++.dg/tsan/pr80110.C: New test.

From-SVN: r246399