add eval-optional-call.js (#2667)

test/language/expressions/optional-chaining/eval-optional-call.js

@@ -0,0 +1,19 @@
+// Copyright 2020 Toru Nagashima.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-optional-chaining-chain-evaluation
+description: optional call invoked on eval function should be indirect eval.
+info: |
+  12.3.9.2 Runtime Semantics: ChainEvaluation
+    OptionalChain: ?. Arguments
+      1. Let thisChain be this OptionalChain.
+      2. Let tailCall be IsInTailPosition(thisChain).
+      3. Return ? EvaluateCall(baseValue, baseReference, Arguments, tailCall).
+
+features: [optional-chaining]
+---*/
+
+const a = "global";
+const b = (a => eval?.("a"))("local")
+
+assert.sameValue(b, a);