add tests for incremental compilation when only private part changed

jps-plugin/testData/incremental/withJava/kotlinUsedInJava/privateChanges/ClassA.kt

@@ -0,0 +1,6 @@
+package test
+
+public class ClassA {
+    public fun meth1() {}
+    private fun meth2() {}
+}

jps-plugin/testData/incremental/withJava/kotlinUsedInJava/privateChanges/ClassA.kt.new

@@ -0,0 +1,6 @@
+package test
+
+public class ClassA {
+    public fun meth1() {}
+    private fun meth3() {}
+}

jps-plugin/testData/incremental/withJava/kotlinUsedInJava/privateChanges/Usage.java

@@ -0,0 +1,7 @@
+package test;
+
+public class Usage {
+    public static void f() {
+        new ClassA().meth1();
+    }
+}

jps-plugin/testData/incremental/withJava/kotlinUsedInJava/privateChanges/build.log

@@ -0,0 +1,6 @@
+Cleaning output files:
+out/production/module/test/ClassA.class
+End of files
+Compiling files:
+src/ClassA.kt
+End of files