Migrate boxInline tests to new multi-file framework

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

@@ -0,0 +1,19 @@
+// FILE: 1.kt
+
+package test
+
+inline fun a(s1: String = "s1", s2: String = "s2", body: (a1: String, a2: String) -> String) = body(s1, s2)
+
+inline fun String.b(body: (a1: String, a2: String) -> String) = a(s2 = this,  body = body)
+
+// FILE: 2.kt
+
+import test.*
+
+fun box(): String {
+    val z = "OK".b { a, b ->
+        a + b
+    }
+
+    return if (z == "s1OK") "OK" else "fail $z"
+}