JVM_IR: fix const reads from other files in same module

compiler/testData/codegen/box/properties/const/anotherFile.kt

@@ -0,0 +1,7 @@
+// FILE: 1.kt
+// File names are important! This file should come before the other one
+// in a lexicographic order.
+const val x = "OK"
+
+// FILE: 2.kt
+fun box() = x