Migrate boxInline tests to new multi-file framework

compiler/testData/codegen/boxInline/functionExpression/extension.2.kt

@@ -1,29 +0,0 @@
-inline fun Inline.calcExt(s: (Int) -> Int, p: Int) : Int {
-    return s(p)
-}
-
-inline fun  Inline.calcExt2(s: Int.() -> Int, p: Int) : Int {
-    return p.s()
-}
-
-class InlineX(val value : Int) {}
-
-class Inline(val res: Int) {
-
-    inline fun InlineX.calcInt(s: (Int, Int) -> Int) : Int {
-        return s(res, this.value)
-    }
-
-    inline fun Double.calcDouble(s: (Int, Double) -> Double) : Double {
-        return s(res, this)
-    }
-
-    fun doWork(l : InlineX) : Int {
-        return l.calcInt(fun (a: Int, b: Int) = a + b)
-    }
-
-    fun doWorkWithDouble(s : Double) : Double {
-        return s.calcDouble(fun (a: Int, b: Double) = a + b)
-    }
-
-}

compiler/testData/codegen/boxInline/functionExpression/extension.kt

@@ -1,3 +1,37 @@
+// FILE: 1.kt
+
+inline fun Inline.calcExt(s: (Int) -> Int, p: Int) : Int {
+    return s(p)
+}
+
+inline fun  Inline.calcExt2(s: Int.() -> Int, p: Int) : Int {
+    return p.s()
+}
+
+class InlineX(val value : Int) {}
+
+class Inline(val res: Int) {
+
+    inline fun InlineX.calcInt(s: (Int, Int) -> Int) : Int {
+        return s(res, this.value)
+    }
+
+    inline fun Double.calcDouble(s: (Int, Double) -> Double) : Double {
+        return s(res, this)
+    }
+
+    fun doWork(l : InlineX) : Int {
+        return l.calcInt(fun (a: Int, b: Int) = a + b)
+    }
+
+    fun doWorkWithDouble(s : Double) : Double {
+        return s.calcDouble(fun (a: Int, b: Double) = a + b)
+    }
+
+}
+
+// FILE: 2.kt
+
 fun test1(): Int {
     val inlineX = Inline(9)
     return inlineX.calcExt(fun(z: Int) = z, 25)
@@ -34,4 +68,4 @@ fun box(): String {
     if (test5() != 20.0) return "test5: ${test5()}"
 
     return "OK"
-}
+}