Fix logic error in assert in IsUndeclaredGlobal()

test/mjsunit/regress/regress-is-contextual.js

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-// Flags: --allow-natives-syntax
-
-function foo(x) {
-  var a = [1, 2, 3, 4, 5, 6, 7, 8];
-  a[x + 5];
-  var result;
-  for (var i = 0; i < 3; i++) {
-    result = a[0 - x];
-  }
-  return result;
+// CallIC accumulates feedback that string index is out of bounds, then
+// misses
+function foo(index) {
+  return text.charAt(index);
 }
 
+var text = "hi there";
 foo(0);
 foo(0);
-%OptimizeFunctionOnNextCall(foo);
-var r = foo(-2);
-assertEquals(3, r);
+foo(100);     // Accumulate feedback that index is out of bounds.
+text = false;
+
+// This line ASSERTS in debug without fix.
+assertThrows(function () { foo(); }, TypeError);