preserve comments on invert if (IDEA-159847)

java/java-tests/testData/codeInsight/invertIfCondition/afterPreserveComments.java

@@ -0,0 +1,9 @@
+// "Invert 'if' condition" "true"
+class A {
+    public void foo() {
+        if (!c) {
+            return;
+        } //comments to restore
+        a();
+    }
+}

java/java-tests/testData/codeInsight/invertIfCondition/beforePreserveComments.java

@@ -0,0 +1,8 @@
+// "Invert 'if' condition" "true"
+class A {
+    public void foo() {
+        <caret>if (c) { //comments to restore
+            a();
+        }
+    }
+}