[co19] Roll co19 to dadc1781676fe5562917ac6bc5ea38da64abe76a

2024-01-18 sgrekhov22@gmail.com dart-lang/co19#2477. Add test checking that an operator can be redeclared (dart-lang/co19#2495)
2024-01-18 sgrekhov22@gmail.com Fixes dart-lang/co19#2479. Delete outdated test co19/LibTest/ffi/sizeOf/sizeOf_A01_t02 (dart-lang/co19#2483)
2024-01-17 sgrekhov22@gmail.com dart-lang/co19#2485. Add constants `as T` tests (dart-lang/co19#2489)
2024-01-17 sgrekhov22@gmail.com dart-lang/co19#2477. Add more constant evaluation tests (dart-lang/co19#2484)
2024-01-17 sgrekhov22@gmail.com Fixes dart-lang/co19#2487. Add tests for type cast and type `void` (dart-lang/co19#2492)
2024-01-17 sgrekhov22@gmail.com Fixes dart-lang/co19#2486. `Pointer.elementAt` replaced by `+` operator (dart-lang/co19#2488)
2024-01-17 sgrekhov22@gmail.com Fixes dart-lang/co19#2491. Add test that an extension type cannot implement type `Never` (dart-lang/co19#2493)
2024-01-12 sgrekhov22@gmail.com dart-lang/co19#2477. Add match operators constants evaluation tests (dart-lang/co19#2482)

Change-Id: I1dee628d4685b0b24296aaabfcf4abcb659fa765
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/347240
Reviewed-by: Alexander Thomas <athom@google.com>
Reviewed-by: William Hesse <whesse@google.com>

DEPS

@@ -54,7 +54,7 @@ vars = {
 
   # co19 is a cipd package automatically generated for each co19 commit.
   # Use tests/co19/update.sh to update this hash.
-  "co19_rev": "b5126f0bd51ea0819df8d5c362574f951a564940",
+  "co19_rev": "dadc1781676fe5562917ac6bc5ea38da64abe76a",
 
   # The internal benchmarks to use. See go/dart-benchmarks-internal
   "benchmarks_internal_rev": "f048a4a853e3062056d39c3db100acdde42f16d6",