[clang] [llvm] [MC] Emit a jump table size section (PR #101962)

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ruotongyu wrote:

Hi, I really like this design and am trying to apply it to more architectures, such as x86. However, it seems that the jump table is not properly mapped to the instruction that references it. Do you have any suggestions on how to correctly associate the jump table with the corresponding assembly instruction? Please let me know if I’m misunderstanding anything.

https://github.com/llvm/llvm-project/pull/101962