[vm/ffi] Clean up static errors test The migration to the new test format ended up duplicating `EmptyStruct` leading to many unrelated errors. This CL removes all the duplicates. And accepts the current analyzer and frontend semantics as is. TEST=tests/ffi/vmspecific_static_checks_test.dart Change-Id: I4f8ad08a892804d6a6a4335807fde324578e900a Cq-Include-Trybots: luci.dart.try:analyzer-linux-release-try,analyzer-mac-release-try,analyzer-win-release-try,front-end-linux-release-x64-try,front-end-nnbd-linux-release-x64-try,front-end-nnbd-mac-release-x64-try,front-end-nnbd-win-release-x64-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/342900 Reviewed-by: Alexander Markov <alexmarkov@google.com>
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