[JS IR] Add test on initialization calling only once

compiler/testData/codegen/box/properties/eagerInitializationGlobal3.kt

@@ -0,0 +1,18 @@
+// TARGET_BACKEND: JS_IR
+// DONT_TARGET_EXACT_BACKEND: WASM
+// PROPERTY_LAZY_INITIALIZATION
+
+// FILE: lib.kt
+var z1 = false
+
+// FILE: lib2.kt
+
+@OptIn(kotlin.ExperimentalStdlibApi::class)
+@JsEagerInitialization
+val x = run { z1 = !z1; 42 }
+
+val y = run { 73 }
+
+fun box(): String {
+    return if (z1) "OK" else "fail"
+}