[ddc] Fix RecordImpl instanceof test The `instanceof` operator needs a reference to the JavaScript class instead of the Dart Type. This avoids an issue when changing the type representation in the new runtime type system where the two are no longer interchangeable. Update the parameter name for `_jsInstanceof()` which which was probably the remnants of a copy paste. Change-Id: I1d3fcf1915fb3e189ad7f3e130e101009ee50381 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/296341 Reviewed-by: Mark Zhou <markzipan@google.com> Commit-Queue: Nicholas Shahan <nshahan@google.com>
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