[FIR2IR] Fix and refactor generation of dynamic call receiver generation

#KT-57988 Fixed

compiler/testData/codegen/box/js/getOperatorOnDynamicThis.kt

@@ -0,0 +1,20 @@
+// TARGET_BACKEND: JS
+// ISSUE: KT-57988
+// FIR_DUMP
+
+inline fun <T : Any> jso(): T = js("({})")
+inline fun <T : Any> jso(block: T.() -> Unit): T = jso<T>().apply(block)
+
+external interface Z {
+    var a: dynamic
+}
+
+fun foo() {
+    jso<Z>().apply {
+        a = jso {
+            this[foo.bar]
+        }
+    }
+}
+
+fun box() = "OK"