[tfa,dart2wasm] Create separate class for each record shape in TFA This allows us to better track all kinds of accesses to record implementation classes in dart2wasm, which generates separate record implementation class per record shape. This change also allows us to remove mutable dispatch targets which were used to implement dynamic accesses to record fields, and make tracking of record field types more accurate (record fields are now versioned per shape). This is also a step towards inferring actual record types. TEST=pkg/vm/testcases/transformations/type_flow/transformer/records.dart TEST=pkg/vm/testcases/transformations/type_flow/transformer/records_dart2wasm.dart TEST=language/records/simple/dynamic_field_access_test Issue https://github.com/dart-lang/sdk/issues/49719 Fixes https://github.com/dart-lang/sdk/issues/51363 Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-nnbd-linux-release-x64-try Change-Id: Icba62a7ca8cfd8ddbc7f2b7c38aeabbef5caec4b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/286950 Reviewed-by: Slava Egorov <vegorov@google.com> Reviewed-by: Ömer Ağacan <omersa@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>
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