dfa live var analysis should honor variables read in closures (IDEA-131719)

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

@@ -0,0 +1,19 @@
+import org.jetbrains.annotations.Nullable;
+
+class Foo {
+
+  void foo(final @Nullable String s, String s2) {
+    if (s2 == null) return;
+    if (s == null) return;
+
+    System.out.println(s2);
+
+    new Runnable() {
+      @Override
+      public void run() {
+        s.hashCode();
+      }
+    }.run();
+  }
+
+}