[K/N][tests] Added a bunch of tests on incremental compilation

native/native.tests/testData/caches/ic/addMethodToInterface2/main/main.1.kt

@@ -0,0 +1,14 @@
+import kotlin.test.*
+import test1.*
+import test2.*
+
+class JImpl : J {
+    override fun baz() = "qxx"
+    override fun foo() = 42
+    override fun bar() = "zzz"
+}
+
+@Test
+fun runTest() {
+    assertEquals("zzz", bar(JImpl()))
+}

native/native.tests/testData/caches/ic/addMethodToInterface2/main/main.kt

@@ -0,0 +1,13 @@
+import kotlin.test.*
+import test1.*
+import test2.*
+
+class JImpl : J {
+    override fun foo() = 42
+    override fun bar() = "zzz"
+}
+
+@Test
+fun runTest() {
+    assertEquals("zzz", bar(JImpl()))
+}