Fix a SPARC -mcbcond compare-and-branch out of range failure.

	* config/sparc/sparc.md (length): Return the correct value for -mflat
	sibcalls to match output_sibcall.

From-SVN: r248422

gcc/ChangeLog

+2017-05-24  Sheldon Lobo  <smlobo@sheldon.us.oracle.com>
+
+	* config/sparc/sparc.md (length): Return the correct value for -mflat
+	sibcalls to match output_sibcall.
+
 2017-05-24  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	PR bootstrap/80860

gcc/config/sparc/sparc.md

@@ -338,7 +338,8 @@
 	     (const_int 2)
 	     (const_int 1))
 	 (eq_attr "type" "sibcall")
-	   (if_then_else (eq_attr "leaf_function" "true")
+	   (if_then_else (ior (eq_attr "leaf_function" "true")
+	                      (eq_attr "flat" "true"))
 	     (if_then_else (eq_attr "empty_delay_slot" "true")
 	       (const_int 3)
 	       (const_int 2))