private name was not found in the current scope. Outer private names
were sometimes coincidentally correctly resolved if the innermost
ClassScope does not need to allocate a context and does not have a
ScopeInfo.

ClassScope: :LookupPrivateName was not walking the scope chain when a
Change-Id: I18937e6cdf2ad4ae15825b11762fbec7a1358145
Bug: v8:9635
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1761547Reviewed-by: Sathya Gunasekaran  <gsathya@chromium.org>
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63295}