Add tests for property const initializers

Merge-request: KT-MR-8661
Merged-by: Vladimir Sukharev <Vladimir.Sukharev@jetbrains.com>

compiler/testData/codegen/box/properties/initializerOfValWithConstExpr.kt

@@ -0,0 +1,12 @@
+// MODULE: lib
+// FILE: lib.kt
+val four = 2 + 2
+
+// MODULE: main(lib)
+// FILE: main.kt
+fun box(): String {
+    if (four == 4)
+        return "OK"
+    else
+        return four.toString()
+}