Revert "'yield' reserved as a keyword"

This reverts commit 434082cadb.

js/js.translator/testData/reservedWords/cases/dataClassValYield.kt

@@ -0,0 +1,15 @@
+package foo
+
+// NOTE THIS FILE IS AUTO-GENERATED by the generateTestDataForReservedWords.kt. DO NOT EDIT!
+
+data class DataClass(val yield: String) {
+    init {
+        testNotRenamed("yield", { yield })
+    }
+}
+
+fun box(): String {
+    DataClass("123")
+
+    return "OK"
+}