[llvm] Add support for DFP IR type. (PR #69718)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

Was trying to pull this branch into my fork to debug a CI failure for the documentation build and annoyingly `git push` works on other people's forks when a PR is open. Things should be back to their original state, but I had to force push. Sorry about that. I'll remember to be more careful next time.

https://github.com/llvm/llvm-project/pull/69718