Java: Don't reuse cached ControlFlow when the context is not equivalent (IDEA-168768)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting/IDEA168768.java

@@ -0,0 +1,35 @@
+public class IDEA168768 {
+  private final boolean b = false;
+  private boolean b2 = false;
+
+  public void m() throws Exception {
+    final long s;
+    if (b) {
+      s = 1;
+    }
+    if (b) {
+      System.out.println(s);
+    }
+  }
+
+  public void m1() throws Exception {
+    final long s;
+    final boolean b1 = false;
+    if (b1) {
+      s = 1;
+    }
+    if (b1) {
+      System.out.println(s);
+    }
+  }
+
+  public void m2() throws Exception {
+    final long s;
+    if (b2) {
+      s = 1;
+    }
+    if (b2) {
+      System.out.println(<error descr="Variable 's' might not have been initialized">s</error>);
+    }
+  }
+}