Try to fix cross-script global scope

tools/generate-runtime-tests.py

Index: tools/generate-runtime-tests.py
diff --git a/tools/generate-runtime-tests.py b/tools/generate-runtime-tests.py
index 981d0530866459d31a8b1ef1df94609fb34fcf2a..e66686584760df970483b47bca30b1920726cd31 100755
--- a/tools/generate-runtime-tests.py
+++ b/tools/generate-runtime-tests.py
@@ -221,7 +221,7 @@ CUSTOM_KNOWN_GOOD_INPUT = {
   "BreakIteratorCurrent": [_BREAK_ITERATOR, None],
   "BreakIteratorFirst": [_BREAK_ITERATOR, None],
   "BreakIteratorNext": [_BREAK_ITERATOR, None],
-  "CompileString": [None, "false", None],
+  "CompileString": [None, None, "false", None],
   "CreateBreakIterator": ["'en-US'", "{type: 'string'}", None, None],
   "CreateJSFunctionProxy": [None, "function() {}", None, None, None],
   "CreatePrivateSymbol": ["\"foo\"", None],
@@ -698,13 +698,16 @@ class Generator(object):
     # TODO(jkummerow): Be more clever here?
     return self._Int32(name)
 
+  def _JSGlobalProxy(self, name, recursion_budget):
+    return self._Variable(name, "this")
+
   def _JSObject(self, name, recursion_budget):
     die = random.random()
     if die < 0.4:
       function = random.choice([self._PlainObject, self._PlainArray,
                                 self._PlainFunction])
     elif die < 0.5:
-      return self._Variable(name, "this")  # Global object.
+      return self._JSGlobalProxy(name, recursion_budget)
     else:
       function = random.choice([self._JSArrayBuffer, self._JSDataView,
                                 self._JSDate, self._JSFunctionProxy,
@@ -751,6 +754,7 @@ class Generator(object):
     "JSFunctionProxy": ["Proxy.createFunction({}, function() {})",
                         _JSFunctionProxy],
     "JSGeneratorObject": ["(function*(){ yield 1; })()", _JSGeneratorObject],
+    "JSGlobalProxy": ["this", _JSGlobalProxy],
     "JSMap": ["new Map()", _JSMap],
     "JSMapIterator": ["new Map().entries()", _JSMapIterator],
     "JSObject": ["new Object()", _JSObject],