Move IR interpreter's tests from ir/loweredIr directory into box

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

@@ -0,0 +1,14 @@
+// TARGET_BACKEND: JVM_IR
+// WITH_STDLIB
+
+const val code = '1'.code
+const val floorDiv = 10.floorDiv(2)
+const val mod = 5.mod(3)
+
+fun box(): String {
+    if (code != 49) return "Fail 1"
+    if (floorDiv != 5) return "Fail 2"
+    if (mod != 2) return "Fail 3"
+
+    return "OK"
+}