re PR c++/59813 (tail-call elimination didn't fire for left-shift of char to cout)

re PR c++/59813 (tail-call elimination didn't fire for left-shift of char to cout)

	PR c++/59813
	PR tree-optimization/89060
	* tree-ssa-live.h (live_vars_map): New typedef.
	(compute_live_vars, live_vars_at_stmt, destroy_live_vars): Declare.
	* tree-ssa-live.c: Include gimple-walk.h and cfganal.h.
	(struct compute_live_vars_data): New type.
	(compute_live_vars_visit, compute_live_vars_1, compute_live_vars,
	live_vars_at_stmt, destroy_live_vars): New functions.
	* tree-tailcall.c: Include tree-ssa-live.h.
	(live_vars, live_vars_vec): New global variables.
	(find_tail_calls): Perform variable life analysis before punting.
	(tree_optimize_tail_calls_1): Clean up live_vars and live_vars_vec.
	* tree-inline.h (struct copy_body_data): Add eh_landing_pad_dest
	member.
	* tree-inline.c (add_clobbers_to_eh_landing_pad): Remove BB argument.
	Perform variable life analysis to select variables that really need
	clobbers added.
	(copy_edges_for_bb): Don't call add_clobbers_to_eh_landing_pad here,
	instead set id->eh_landing_pad_dest and assert it is the same.
	(copy_cfg_body): Call it here if id->eh_landing_pad_dest is non-NULL.

	* gcc.dg/tree-ssa/pr89060.c: New test.

From-SVN: r271013