[llvm] [Offload] Introduce offload-tblgen and initial new API implementation (PR #108413)

[Joseph Huber via llvm-commits]

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+VERS1.0 {
+global:
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jhuber6 wrote:

We should just put `ol_` as the prefix and then use `ol_*`

https://github.com/llvm/llvm-project/pull/108413