Minor. Merge multiplatformTypeRefinement testdata with multiplatform testdata

idea/testData/multiplatform/diamondModuleDependency1/common-2-1/common-2-1.kt

@@ -0,0 +1,13 @@
+@file:Suppress("UNUSED_PARAMETER")
+
+package sample
+
+actual interface A {
+    actual fun foo()
+    fun bar()
+}
+
+fun take_A_common_2_1(x: A) {
+    x.foo()
+    x.bar()
+}