Migrate boxInline tests to new multi-file framework

compiler/testData/codegen/boxInline/defaultValues/kt5685.kt

@@ -0,0 +1,24 @@
+// FILE: 1.kt
+
+package test
+
+class Measurements
+{
+    inline fun measure(key: String, logEvery: Long = -1, divisor: Int = 1, body: () -> Unit): String {
+        body()
+        return key
+    }
+}
+
+// FILE: 2.kt
+
+import test.*
+
+fun box(): String {
+    var s1 = ""
+    val s2 = Measurements().measure("K") {
+        s1 = "O"
+    }
+
+    return s1 + s2
+}