Fix asm-wasm.js test.

R=bradnelson@chromium.org
BUG=https://bugs.chromium.org/p/v8/issues/detail?id=4203
TEST=asm-wasm.js
LOG=N

Review URL: https://codereview.chromium.org/1664993002

Cr-Commit-Position: refs/heads/master@{#33713}

test/mjsunit/wasm/asm-wasm.js

@@ -442,7 +442,7 @@ function TestHeapAccessIntTypes() {
     module.__init__();
     assertEquals(7, module.caller());
     assertEquals(7, memory_view[2]);
-    assertEquals(7, _WASMEXP_.instantiateModuleFromAsm(code));
+    assertEquals(7, _WASMEXP_.instantiateModuleFromAsm(code).caller());
   }
 }