CountingLoop: support decreasing loops

Fixes IDEA-190412 Unroll loop action: support decreasing loops

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/unrollLoop/afterUnrollCountingDescreasing.java

@@ -0,0 +1,16 @@
+// "Unroll loop" "true"
+class Test {
+  void test() {
+      System.out.println("Hi!" + 10);
+      System.out.println("Hi!" + 9);
+      System.out.println("Hi!" + 8);
+      System.out.println("Hi!" + 7);
+      System.out.println("Hi!" + 6);
+      System.out.println("Hi!" + 5);
+      System.out.println("Hi!" + 4);
+      System.out.println("Hi!" + 3);
+      System.out.println("Hi!" + 2);
+      System.out.println("Hi!" + 1);
+      System.out.println("Hi!" + 0);
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/unrollLoop/beforeUnrollCounting.java

@@ -1,7 +1,7 @@
 // "Unroll loop" "true"
 class Test {
   void test() {
-    fo<caret>r (int i = 0; i < 10; i++ // line comment
+    fo<caret>r (int i = 0; i != 10; i++ // line comment
     ) {
       System.out.println("Hi!" + i);
     }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/unrollLoop/beforeUnrollCountingDescreasing.java

@@ -0,0 +1,8 @@
+// "Unroll loop" "true"
+class Test {
+  void test() {
+    fo<caret>r (int i = 10; 0 <= i; --i) {
+      System.out.println("Hi!" + i);
+    }
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/unrollLoop/beforeUnrollCountingDescreasingWrong.java

@@ -0,0 +1,8 @@
+// "Unroll loop" "false"
+class Test {
+  void test() {
+    fo<caret>r (int i = 10; i <= 0; --i) {
+      System.out.println("Hi!" + i);
+    }
+  }
+}