Fix JUMP_LABEL documentation

	* doc/rtl.texi (JUMP_LABEL): Document RETURN and SIMPLE_RETURN values.

From-SVN: r240325

gcc/ChangeLog

+2016-09-21  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* doc/rtl.texi (JUMP_LABEL): Document RETURN and SIMPLE_RETURN values.
+
 2016-09-21  Bernd Edlinger  <bernd.edlinger@hotmail.de>
 
 	PR tree-optimization/77550

gcc/doc/rtl.texi

@@ -3525,8 +3525,8 @@ and @code{addr_diff_vec}, where @code{JUMP_LABEL} is @code{NULL_RTX}
 and the only way to find the labels is to scan the entire body of the
 insn.
 
-Return insns count as jumps, but since they do not refer to any
-labels, their @code{JUMP_LABEL} is @code{NULL_RTX}.
+Return insns count as jumps, but their @code{JUMP_LABEL} is @code{RETURN}
+or @code{SIMPLE_RETURN}.
 
 @findex call_insn
 @item call_insn