DfaMemoryStateImpl#resolveVariableValue: filter special fields

Otherwise String.length() matches to every field which results in warning every time field is checked for negative value after assignment

java/java-tests/testData/inspection/dataFlow/fixture/FieldAssignedNegative.java

@@ -0,0 +1,19 @@
+class FieldReassignInt {
+  void test() {
+    Holder res = new Holder();
+    int pos = getSomething();
+    if (pos == -1) System.out.println("oops");
+    res.position = pos;
+    if (pos == -1) System.out.println("oops");
+    if (res.position == -1) System.out.println("oops");
+    System.out.println(res);
+  }
+
+  static class Holder {
+    int position;
+  }
+
+  int getSomething() {
+    return 42;
+  }
+}