[IR] Reorganize test files in involvesIrInterpreter dir

compiler/testData/codegen/box/involvesIrInterpreter/stdlibConst.kt

@@ -0,0 +1,16 @@
+// TARGET_BACKEND: JVM_IR
+// TARGET_BACKEND: NATIVE
+// TARGET_BACKEND: JS_IR
+// WITH_STDLIB
+
+const val code = '1'.<!EVALUATED("49")!>code<!>
+const val floorDiv = 10.<!EVALUATED("5")!>floorDiv(2)<!>
+const val mod = 5.<!EVALUATED("2")!>mod(3)<!>
+
+fun box(): String {
+    if (<!EVALUATED("false")!>code != 49<!>) return "Fail 1"
+    if (<!EVALUATED("false")!>floorDiv != 5<!>) return "Fail 2"
+    if (<!EVALUATED("false")!>mod != 2<!>) return "Fail 3"
+
+    return "OK"
+}