[llvm] [DWARFLinker] Handle empty sequences when processing `DW_AT_LLVM_stmt_sequence` attributes (PR #132875)

[Ellis Hoag via llvm-commits]

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ellishg wrote:

Actually I just realized `llvm/utils/update_test_body.py` won't avoid checking in the binaries. But it does provide a standard way to generate these binaries. We should set a good example of using this new tool instead of ad hoc scripts.

https://github.com/llvm/llvm-project/pull/132875