builtins.c (expand_builtin_memory_copy_args): Add might_overlap parm.

builtins.c (expand_builtin_memory_copy_args): Add might_overlap parm.

2019-10-02  Aaron Sawdey <acsawdey@linux.ibm.com>

	* builtins.c (expand_builtin_memory_copy_args): Add might_overlap parm.
	(expand_builtin_memcpy): Use might_overlap parm.
	(expand_builtin_mempcpy_args): Use might_overlap parm.
	(expand_builtin_memmove): Call expand_builtin_memory_copy_args.
	(expand_builtin_memory_copy_args): Add might_overlap parm.
	* expr.c (emit_block_move_via_cpymem): Rename to
	emit_block_move_via_pattern, add might_overlap parm, use cpymem
	or movmem optab as appropriate.
	(emit_block_move_hints): Add might_overlap parm, do the right
	thing for might_overlap==true.
	* expr.h (emit_block_move_hints): Update prototype.

From-SVN: r276461