[llvm] [CodeGenTypes] Remove explicit VT numbers from ValueTypes.td (PR #169670)

[Alex MacLean via llvm-commits]

https://github.com/AlexMaclean approved this pull request.

Nice, I prefer this to https://github.com/llvm/llvm-project/pull/169071 as well 

https://github.com/llvm/llvm-project/pull/169670