Move java 8 tests to java8 folder

compiler/testData/codegen/java8/box/jvm8/kt6301.kt

@@ -0,0 +1,27 @@
+// !LANGUAGE: +JvmStaticInInterface
+// WITH_RUNTIME
+// TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
+// FILE: test.kt
+fun box(): String {
+    return Java.test()
+}
+
+interface Foo {
+
+    companion object {
+        @JvmStatic
+        fun foo() = "O"
+
+        @JvmStatic
+        var fooProp = ""
+    }
+}
+
+// FILE: Java.java
+public class Java {
+    public static String test() {
+        Foo.setFooProp("K");
+        return Foo.foo() + Foo.getFooProp();
+    }
+}

compiler/testData/codegen/java8/box/jvm8/kt6301_2.kt

@@ -0,0 +1,27 @@
+// !LANGUAGE: +JvmStaticInInterface
+// WITH_RUNTIME
+// TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
+// FILE: test.kt
+fun box(): String {
+    return Java.test()
+}
+
+interface Foo {
+
+    companion object {
+        @JvmStatic
+        fun foo() = "O"
+
+
+        val fooProp = "K"
+            @JvmStatic get
+    }
+}
+
+// FILE: Java.java
+public class Java {
+    public static String test() {
+        return Foo.foo() + Foo.getFooProp();
+    }
+}