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

[Jay Foad via llvm-commits]

jayfoad wrote:

> Nice, I prefer this to #169071 as well

Thanks, I appreciate that! I was impressed by the simplicity of your patch, but I am not too keen on relying so heavily on !instances.

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