Fix the name of RETURNCONTRACT instruction in EOF assembly output

[sky-coderay]

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[r0qs]

Thanks @sky-coderay this was a oversight in #15512. Some tests will need to have their expectations updated as well. These tests are: https://github.com/ethereum/solidity/blob/develop/test/libyul/objectCompiler/eof/creation_with_immutables.yul#L72 and https://github.com/ethereum/solidity/blob/develop/test/cmdlineTests/strict_asm_eof_container_prague/output#L92

[r0qs]

I took the liberty of updating the test expectations for you. Also, a changelog entry is not necessary, as this bug only affects EOF code generation.

[cameel]

Good find. Since the compiler does not support importing this assembly form (only JSON), we never really test if it's well formed and if the names match the instructions. I wonder if we have more bugs like this hiding there.