[cfe] Dot Shorthands: Handle constructor tearoffs. This CL adds support for constructor tearoffs in dot shorthands. If there's any type parameters on the tearoff and it's a constructor, we produce an error. I also updated the expectations of existing tests due to an early return of `InvalidExpression`s and added language + cfe tests for the new behavior. This CL fixes the following co19 tests and is a follow up to https://github.com/dart-lang/co19/issues/3122 co19/LanguageFeatures/Static-access-shorthand/constant_expression_A03_t01 co19/LanguageFeatures/Static-access-shorthand/constant_expression_A04_t01 co19/LanguageFeatures/Static-access-shorthand/semantics_A05_t01 co19/LanguageFeatures/Static-access-shorthand/constant_expression_A03_t02 Bug: https://github.com/dart-lang/sdk/issues/59758, https://github.com/dart-lang/co19/issues/3122 Change-Id: I1ea837342ad818cd3b1de9e422065f42e8a61d6b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/419782 Commit-Queue: Kallen Tu <kallentu@google.com> Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
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