[vm/ffi] Unify `TypedDataBase` wrappers For getting the address of `Struct` fields and `Array` elements it would be useful to access the `_typedDataBase` field in these 'wrappers' in a unified way. This CL makes `Array` extend `_Compound`. Since `Array` is not a `SizedNativeType`, the implements clauses for `Struct` and `Union` are moved to these classes. Moreover, any references to 'compound' which only apply to struct or union are updated. TEST=test/ffi Bug: https://github.com/dart-lang/sdk/issues/44589 Bug: https://github.com/dart-lang/sdk/issues/54739 Bug: https://github.com/dart-lang/sdk/issues/41237 CoreLibraryReviewExempt: No API change, only refactoring. Change-Id: Ib9d8bccd4872df04bcc67731e4052f826ab70af4 Cq-Include-Trybots: luci.dart.try:vm-aot-android-release-arm64c-try,vm-aot-android-release-arm_x64-try,vm-aot-linux-debug-x64-try,vm-aot-linux-debug-x64c-try,vm-aot-mac-release-arm64-try,vm-aot-mac-release-x64-try,vm-aot-obfuscate-linux-release-x64-try,vm-aot-optimization-level-linux-release-x64-try,vm-aot-win-debug-arm64-try,vm-aot-win-debug-x64-try,vm-appjit-linux-debug-x64-try,vm-asan-linux-release-x64-try,vm-checked-mac-release-arm64-try,vm-eager-optimization-linux-release-ia32-try,vm-eager-optimization-linux-release-x64-try,vm-ffi-android-debug-arm-try,vm-ffi-android-debug-arm64c-try,vm-ffi-qemu-linux-release-arm-try,vm-ffi-qemu-linux-release-riscv64-try,vm-fuchsia-release-x64-try,vm-kernel-linux-debug-x64-try,vm-kernel-precomp-linux-release-x64-try,vm-linux-debug-ia32-try,vm-linux-debug-x64-try,vm-linux-debug-x64c-try,vm-mac-debug-arm64-try,vm-mac-debug-x64-try,vm-msan-linux-release-x64-try,vm-reload-linux-debug-x64-try,vm-reload-rollback-linux-debug-x64-try,vm-ubsan-linux-release-x64-try,vm-win-debug-arm64-try,vm-win-debug-x64-try,vm-win-release-ia32-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/350960 Reviewed-by: Martin Kustermann <kustermann@google.com> Reviewed-by: Liam Appelbe <liama@google.com>
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