[llvm] Revert "LLVMContext: Cleanup registration of known bundle IDs" (PR #120396)

[Jan Patrick Lehr via llvm-commits]

jplehr wrote:

> Can just remove the constexpr (or revert back to the original version which returned empty string)

I don't have an opinion. Whatever is better.

https://github.com/llvm/llvm-project/pull/120396