[llvm] [TableGen] Rework error reporting for duplicate Feature/Processor. (PR #102257)

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

> I realized that I forgot to update the commit message to describe the getID() changes :( It has:
> 
> ```
>     - Make the sorting deterministic by using record name as a secondary
>       key for sorting, and re-enable SubtargetFeatureUniqueNames.td test
>       that was disabled due to the non-determinism of the error messages.
>     - Change wording of error message when duplicate records are found to
>       be source code position agnostic, since `First` may not be before
>       `Second` lexically.
> ```
> 
> Oh well, need to be more careful next time.

Yeah, my bad too. I was to tired to read it to the end.

https://github.com/llvm/llvm-project/pull/102257