IrInterpreter: interpret IrGetField properly

compiler/testData/codegen/box/fir/ConstValAccess.kt

@@ -0,0 +1,18 @@
+// TARGET_BACKEND: JVM
+
+// MODULE: lib
+// FILE: A.kt
+
+object Obj {
+    const val A_CONST = "O"
+}
+
+// MODULE: main(lib)
+// FILE: B.kt
+
+fun box(): String {
+    val s = B_CONST
+    return s + "K";
+}
+
+const val B_CONST = Obj.A_CONST