[wasm] Throw real Error on wasm trap

test/mjsunit/wasm/wasm-constants.js

Index: test/mjsunit/wasm/wasm-constants.js
diff --git a/test/mjsunit/wasm/wasm-constants.js b/test/mjsunit/wasm/wasm-constants.js
index cc620bb4586c8d703f7d3a4eb6091c0b2d10a84e..ead2769b8cb9d904817b483793b2d7202462e7ab 100644
--- a/test/mjsunit/wasm/wasm-constants.js
+++ b/test/mjsunit/wasm/wasm-constants.js
@@ -290,8 +290,8 @@ function assertTraps(trap, code) {
       }
       threwException = false;
     } catch (e) {
-      assertEquals("string", typeof e);
-      assertEquals(kTrapMsgs[trap], e);
+      assertEquals("object", typeof e);
+      assertEquals(kTrapMsgs[trap], e.message);
       // Success.
       return;
     }