Improve struct RMW validation and interpretation #7216
Merged
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Add missing validation rules checking that accessed fields have allowed
types. Copy the proposed upstream spec tests for this validation from
WebAssembly/shared-everything-threads#85 with
minor changes to account for differences in supported text format and
to comment out unsupported tests.
Also implement interpretation for the RMW instructions and add spec
tests testing their execution. It is simpler to implement both
validation and interpretation at once because the proposed upstream
spec tests require both to pass.