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

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

@@ -0,0 +1,51 @@
+// TARGET_BACKEND: JVM_IR
+
+const val someStr = "123"
+const val otherStr = "other"
+
+const val oneVal = 1
+
+const val plus1 = someStr.plus(otherStr)
+const val plus2 = someStr.plus(oneVal)
+
+const val length1 = someStr.length
+const val length2 = otherStr.length
+
+const val get1 = someStr.get(0)
+const val get2 = otherStr.get(oneVal)
+
+const val compareTo1 = someStr.compareTo("123")
+const val compareTo2 = someStr.compareTo(otherStr)
+const val compareTo3 = otherStr.compareTo(someStr)
+
+const val equals1 = someStr.equals("123")
+const val equals2 = someStr.equals(otherStr)
+const val equals3 = otherStr.equals(someStr)
+const val equals4 = someStr.equals(oneVal)
+const val equals5 = someStr.equals(1)
+
+const val toString1 = someStr.toString()
+
+fun box(): String {
+    if (plus1 != "123other")    return "Fail 1.1"
+    if (plus2 != "1231")        return "Fail 1.2"
+
+    if (length1 != 3)   return "Fail 2.1"
+    if (length2 != 5)   return "Fail 2.2"
+
+    if (get1 != '1')    return "Fail 3.1"
+    if (get2 != 't')    return "Fail 3.2"
+
+    if (compareTo1 != 0)    return "Fail 4.1"
+    if (compareTo2 >= 0)    return "Fail 4.2"
+    if (compareTo3 <= 0)    return "Fail 4.3"
+
+    if (equals1 != true)    return "Fail 5.1"
+    if (equals2 != false)   return "Fail 5.2"
+    if (equals3 != false)   return "Fail 5.3"
+    if (equals4 != false)   return "Fail 5.4"
+    if (equals5 != false)   return "Fail 5.5"
+
+    if (toString1 != "123") return "Fail 6.1"
+    return "OK"
+}