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

[Dmitry Vasilyev via llvm-commits]

slydiman wrote:

Note a side effect in lldb-server https://github.com/llvm/llvm-project/pull/132274#issuecomment-2778431560
I recently reduced the size of lldb-server (Linux AArch64) from 47MB to 17MB and was going to reduce it to 8MB. But now it is impossible. Any suggestions?

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