[mlir][LLVMIR] Support new debug records format

[smeenai]

Per https://discourse.llvm.org/t/psa-ir-output-changing-from-debug-intrinsics-to-debug-records/79578/3, debug intrinsics support is being removed after the LLVM 20 branch cut. The LLVM IR translator relies on debug intrinsics. The comment says that "Debug records are not currently supported in the LLVM IR translator"; I'm not sure if it's just a translator issue or a broader lack of support in the LLVM IR dialect. Either way, it'll need to be fixed once LLVM no longer supports debug intrinsics. https://llvm.org/docs/RemoveDIsDebugInfo.html has an LLVM migration guide, for reference.

CCing some people I've seen working on the LLVM dialect recently or might have interest: @bcardosolopes @gysit @xlauko @Dinistro @PikachuHyA

[llvmbot]

@llvm/issue-subscribers-mlir-llvm

Author: Shoaib Meenai (smeenai)

Per https://discourse.llvm.org/t/psa-ir-output-changing-from-debug-intrinsics-to-debug-records/79578/3, debug intrinsics support is being removed after the LLVM 20 branch cut. The LLVM IR translator [relies on debug intrinsics](https://github.com/llvm/llvm-project/blob/10a9dcab0a5904ce6c12efb3555a2e31017bce92/mlir/lib/Target/LLVMIR/ConvertFromLLVMIR.cpp#L59). The comment says that "Debug records are not currently supported in the LLVM IR translator"; I'm not sure if it's just a translator issue or a broader lack of support in the LLVM IR dialect. Either way, it'll need to be fixed once LLVM no longer supports debug intrinsics. https://llvm.org/docs/RemoveDIsDebugInfo.html has an LLVM migration guide, for reference.

CCing some people I've seen working on the LLVM dialect recently: @bcardosolopes @gysit @xlauko @Dinistro

[gysit]

I think it is more than a translation issue. Ideally, we would represent the new debug records as part of MLIR Location infrastructure. Converging to a design that is generally accepted and finding someone that has free cycles to implement this may take some time though.

A possible solution for the import from LLVM IR may be to drop debug info initially until we have a working solution. However, I fear exporting back to LLVM proper will also not work anymore?