Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/regressions/kt715.kt

@@ -0,0 +1,16 @@
+// WITH_RUNTIME
+
+import kotlin.*
+
+@Suppress("REIFIED_TYPE_PARAMETER_NO_INLINE")
+inline fun <reified T: Any> javaClass(): Class<T> = T::class.java
+
+val test = "lala".javaClass
+
+val test2 = javaClass<Iterator<Int>> ()
+
+fun box(): String {
+    if(test.getCanonicalName() != "java.lang.String") return "fail"
+    if(test2.getCanonicalName() != "java.util.Iterator") return "fail"
+    return "OK"
+}