[llvm] Add __attribute__((retain)) to LLVM_DUMP_METHOD (PR #133025)

[Matthias Braun via llvm-commits]

MatzeB wrote:

Indeed that GCC bug would be a problem. I could publish a follow-up that requires GCC >= 14 to use the retain attribute, do you know if that would be sufficient here?

https://github.com/llvm/llvm-project/pull/133025