[llvm] [llvm-pdbutil] Avoid reading EC names from non-EC modules (PR #223253)

[via llvm-commits]

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Nerixyz wrote:

We should avoid checking in new binaries. You can use `llvm-pdbutil pdb2yaml/yaml2pdb` and check in a yaml file.

https://github.com/llvm/llvm-project/pull/223253