[error] Improve error message for array spread

... on non-iterable object. In CallPrinter::VisitAssignment,
when found_ is true, we could print node->target to show the
error node value, avoid printing twice for the assignment.

Bug: v8:10854
Change-Id: I5f295f46b5639b715f762935e675598d1d780f98
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3586763Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: 王澳 <wangao.james@bytedance.com>
Cr-Commit-Position: refs/heads/main@{#79997}

src/ast/prettyprinter.cc

@@ -343,6 +343,10 @@ void CallPrinter::VisitAssignment(Assignment* node) {
     }
   }
   if (!was_found) {
+    if (found_) {
+      Find(node->target(), true);
+      return;
+    }
     Find(node->target());
     if (node->target()->IsArrayLiteral()) {
       // Special case the visit for destructuring array assignment.

test/message/fail/array-spread-non-iterable-object.js

+// Copyright 2022 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+[...(a={})]

test/message/fail/array-spread-non-iterable-object.out

+*%(basename)s:5: TypeError: a is not iterable
+[...(a={})]
+      ^
+TypeError: a is not iterable
+    at *%(basename)s:5:7