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Fix call to [get|record]_sp_limit for thumb arch #12824

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@bharrisau

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@bharrisau

Now with #12407 thumb is supported for rust_stack_exhausted(). This calls get_sp_limit() which calls the implementation in rt/arch/arm/record_sp.S. This code isn't supported for thumb targets though. The call should be returning *STACK_LIMIT for thumb.

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