[analysis_server] use single function per type for canParse
Fixes #49229 Change-Id: I87d2dea79f8786b826162d132a63c69a2ebaba67 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/248009 Reviewed-by: Danny Tuppeny <danny@tuppeny.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
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