ControlFlowUtil#internalDepthFirstSearch: rewrite subroutine tracking

Now every graph edge is accompanied with subroutine stack.
Also shared mutable state is removed from instructions (now it's local to DFS procedure).
Fixes IDEA-201093 Unreachable bug in three try catch while two have finally

GitOrigin-RevId: b600ba63e2da315c9830836adcdc4d8fecf92ca3

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

@@ -0,0 +1,13 @@
+class Test {
+  public static void main(String[] args) {
+    try {
+      try {} catch (Exception e) {} finally {
+        try {} catch (Exception e) {} finally {
+          for (int i = 0; i < 10; i++) {
+          }
+        }
+      }
+      System.out.println("Reachable");
+    }catch(Exception e) {}
+  }
+}