SplitIfAction and ExtractIfConditionAction code unified

Fixes IDEA-152047 Better "Split into 2 if's" result for else-if cases

java/java-tests/testData/codeInsight/splitIfAction/beforeCommentInside.java

@@ -0,0 +1,8 @@
+class C {
+    void foo() {
+        if (a /*inside*/ || c |<caret>| //comment
+            b) {
+            call();
+        }
+    }
+}