Migrate boxInline tests to new multi-file framework

compiler/testData/codegen/boxInline/simple/classObject.kt

@@ -0,0 +1,44 @@
+// FILE: 1.kt
+
+package test
+
+inline fun inline(s: () -> String): String {
+    return s()
+}
+
+class InlineAll {
+
+    inline fun inline(s: () -> String): String {
+        return s()
+    }
+
+    companion object {
+        inline fun inline(s: () -> String): String {
+            return s()
+        }
+    }
+}
+
+// FILE: 2.kt
+
+import test.*
+
+fun testClassObjectCall(): String {
+    return InlineAll.inline({"classobject"})
+}
+
+fun testInstanceCall(): String {
+    val inlineX = InlineAll()
+    return inlineX.inline({"instance"})
+}
+
+fun testPackageCall(): String {
+    return inline({"package"})
+}
+
+fun box(): String {
+    if (testClassObjectCall() != "classobject") return "test1: ${testClassObjectCall()}"
+    if (testInstanceCall() != "instance") return "test2: ${testInstanceCall()}"
+    if (testPackageCall() != "package") return "test3: ${testPackageCall()}"
+    return "OK"
+}