[wasm] Memory buffer should be detached after Memory.Grow

test/mjsunit/wasm/js-api.js

Index: test/mjsunit/wasm/js-api.js
diff --git a/test/mjsunit/wasm/js-api.js b/test/mjsunit/wasm/js-api.js
index 3c195dc130a3cad7cbd98d91ac4246ced3817ac7..d4fad1413bbea80b7818e20a8baf08b78a458a83 100644
--- a/test/mjsunit/wasm/js-api.js
+++ b/test/mjsunit/wasm/js-api.js
@@ -469,8 +469,8 @@ assertEq(mem.grow(0), 1);
 buf = mem.buffer;
 assertEq(buf.byteLength, kPageSize);
 assertEq(mem.grow(1), 1);
-// TODO(gdeepti): assertTrue(buf !== mem.buffer);
-// TODO(gdeepti): assertEq(buf.byteLength, 0);
+assertTrue(buf !== mem.buffer);
+assertEq(buf.byteLength, 0);
 buf = mem.buffer;
 assertEq(buf.byteLength, 2 * kPageSize);
 assertErrorMessage(() => mem.grow(1), Error, /failed to grow memory/);