[dart2js] Moving entity map to kernel dump info annotator
[dart2js] Moving entity map to kernel dump info annotator

Change-Id: I1aa5167759e1cdb1bdfbea76062df8fcafb8a67a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/250022
Reviewed-by: Joshua Litt <9f8daed1ab51574c9a48ffacb03e4a1adb4f880c@google.com>
Commit-Queue: Mark Zhou <654f5fe0c4ca6c799b0e735dcf3fc1c389f35bf9@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk