PR middle-end/78540
	* rtl.h (remove_reg_equal_equiv_notes): Return bool instead of void.
	* rtlanal.c (remove_reg_equal_equiv_notes): Return true if any
	note has been removed.
	* postreload.c (reload_combine_recognize_pattern): If
	remove_reg_equal_equiv_notes returns true, call df_notes_rescan.

	* gcc.dg/pr78540.c: New test.

From-SVN: r242937