PR ipa/65076
	* passes.def: Add pass_nothrow.
	* ipa-pure-const.c: (pass_data_nothrow): New.
	(pass_nothrow): New.
	(pass_nothrow::execute): New.
	(make_pass_nothrow): New.
	* tree-pass.h (make_pass_nothrow): Declare.

From-SVN: r221719