Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/storeStackBeforeInline/simple.kt

@@ -0,0 +1,18 @@
+// WITH_RUNTIME
+
+import kotlin.test.assertEquals
+
+inline fun bar(x: Int) : Int {
+    return x
+}
+
+fun foobar(x: Int, y: Int, z: Int) = x + y + z
+
+fun foo() : Int {
+    return foobar(1, bar(2), 3)
+}
+
+fun box() : String {
+    assertEquals(6, foo())
+    return "OK"
+}