basic multifile class codegen tests

compiler/testData/codegen/boxWithJava/fileClasses/multifileClassWith2Files/Baz.java

@@ -0,0 +1,5 @@
+public class Baz {
+    public static String baz() {
+        return Util.foo() + Util.bar();
+    }
+}

compiler/testData/codegen/boxWithJava/fileClasses/multifileClassWith2Files/bar.kt

@@ -0,0 +1,3 @@
+@file:JvmName("Util")
+@file:JvmMultifileClass
+public fun bar(): String = "K"

compiler/testData/codegen/boxWithJava/fileClasses/multifileClassWith2Files/foo.kt

@@ -0,0 +1,3 @@
+@file:JvmName("Util")
+@file:JvmMultifileClass
+public fun foo(): String = "O"

compiler/testData/codegen/boxWithJava/fileClasses/multifileClassWith2Files/multifileClassWith2Files.kt

@@ -0,0 +1 @@
+fun box(): String = Baz.baz()