[wasm] Names of exported functions should be the stringified function index.

test/mjsunit/wasm/indirect-tables.js

Index: test/mjsunit/wasm/indirect-tables.js
diff --git a/test/mjsunit/wasm/indirect-tables.js b/test/mjsunit/wasm/indirect-tables.js
index 62b900586ce942d2c09899709d055332db2783b3..29e4a50031749d03865bb163403308d6b6afcf19 100644
--- a/test/mjsunit/wasm/indirect-tables.js
+++ b/test/mjsunit/wasm/indirect-tables.js
@@ -81,7 +81,7 @@ function js_div(a, b) { return (a / b) | 0; }
     assertEquals(2, mul.length);
     assertEquals(2, add.length);
     assertEquals(2, sub.length);
-    assertEquals("blarg", add.name);
+    assertEquals(String(f.add.index), add.name);
 
     let exp_div = table.get(i+3);
     assertEquals("function", typeof exp_div);