Bug 878495 - In shell, print "[native code]" for native functions. r=luke

js/src/jit-test/tests/asm.js/testBug878495.js

@@ -0,0 +1,10 @@
+var disassemble = disassemble || false;
+if (disassemble)
+{
+    disassemble("-r", (function() {
+        (function() {
+            "use asm"
+            return {}
+        })()
+    }))
+}

js/src/shell/js.cpp

@@ -1911,7 +1911,9 @@ DisassembleScript(JSContext *cx, HandleScript script, HandleFunction fun, bool l
                 RootedFunction f(cx, obj->toFunction());
                 RootedScript script(cx);
                 JSFunction::maybeGetOrCreateScript(cx, f, &script);
-                if (!DisassembleScript(cx, script, fun, lines, recursive, sp))
+                if (!script)
+                    Sprint(sp, "[native code]\n");
+                else if (!DisassembleScript(cx, script, fun, lines, recursive, sp))
                     return false;
             }
         }