[llvm] [llvm-mc] Propagate invalid-token errors from byteArrayFromString (PR #217533)

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StevenYangCC wrote:

> > This commit will be authored by [34805829+StevenYangCC at users.noreply.github.com](mailto:34805829+StevenYangCC at users.noreply.github.com).
> 
> Please disable the hidden email option https://discourse.llvm.org/t/github-hidden-email-and-automated-checker-for-pull-requests/90629

Thanks for pointing that out! I've disabled the hidden email option and updated the commits with my real email. Please take another look.

https://github.com/llvm/llvm-project/pull/217533