As of the normative change [1] of spec, the export name can be
arbitrary strings. Element accesses on module namespace objects
will be interpreted as indexed properties, so those element key
exports should be setup as elements.

[1]: https://github.com/tc39/ecma262/pull/2154

Bug: v8:11690
Change-Id: I3b724d11b9306739268fc5348bae87911a8da18c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3219945Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: legendecas <legendecas@gmail.com>
Cr-Commit-Position: refs/heads/main@{#77581}