[modules] Disable Crankshaft for functions referencing module variables.

test/mjsunit/modules-turbo.js

Index: test/mjsunit/modules-turbo.js
diff --git a/test/mjsunit/regress/regress-crbug-630923.js b/test/mjsunit/modules-turbo.js
similarity index 72%
copy from test/mjsunit/regress/regress-crbug-630923.js
copy to test/mjsunit/modules-turbo.js
index ff0d2dd05efbedec15a515545eac2184c36c59f3..7c31682a5be4702202b62b4f06b8724b3161e00c 100644
--- a/test/mjsunit/regress/regress-crbug-630923.js
+++ b/test/mjsunit/modules-turbo.js
@@ -2,15 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// MODULE
 // Flags: --allow-natives-syntax
 
-var o = {};
-function bar(o) {
-  return 1 + (o.t ? 1 : 2);
-}
-function foo() {
-  bar(o);
-}
+export let x = 0;
+function foo() { x++ };
 foo();
 %OptimizeFunctionOnNextCall(foo);
 foo();
+assertOptimized(foo);
+assertEquals(2, x);