Refine dirty files computation in case of Java source changes

#KT-17621 In Progress

jps-plugin/testData/incremental/withJava/javaUsedInKotlin/changeSignature/JavaClass.java

@@ -1,4 +1,7 @@
 public class JavaClass {
-    public static void foo() {
+    public void foo() {
+    }
+
+    public void bar() {
     }
 }

jps-plugin/testData/incremental/withJava/javaUsedInKotlin/changeSignature/JavaClass.java.new

@@ -1,5 +1,8 @@
 public class JavaClass {
-    public static String foo() {
-        return ":)";
+    public String foo() {
+        return "";
+    }
+
+    public void bar() {
     }
 }

jps-plugin/testData/incremental/withJava/javaUsedInKotlin/changeSignature/notUsage.kt

@@ -0,0 +1,3 @@
+fun main(args: Array<String>) {
+    JavaClass().bar()
+}

jps-plugin/testData/incremental/withJava/javaUsedInKotlin/changeSignature/usage.kt

@@ -1,3 +1,3 @@
 fun main(args: Array<String>) {
-    JavaClass.foo()
+    JavaClass().foo()
 }