Revert "Don't clone constant ASTs when running with Analysis Driver." This reverts commit 77c5677abe7d6e3a30691df720f223f0ad4c1b8e. This change contradicts to another performance work I'm doing in the analyzer branch, and I'd like to revert it in both branches. R=brianwilkerson@google.com, paulberry@google.com Change-Id: I7136f17ef92da25418bbcc3079077b968129f956 Reviewed-on: https://dart-review.googlesource.com/c/80504 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Reviewed-by: Paul Berry <paulberry@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
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