[llvm] [MVT][TableGen] Extend Machine Value Type to `uint16_t` (PR #99657)

[Craig Topper via llvm-commits]

topperc wrote:

> > This is showing a compile time regression [llvm-compile-time-tracker.com/compare.php?from=9718f3dec1c366809b0c2508ba77cc5dd3cf82ec&to=a4c6ebeb20168bbedbb1a3aff9f5096416e5914a&stat=instructions:u](https://llvm-compile-time-tracker.com/compare.php?from=9718f3dec1c366809b0c2508ba77cc5dd3cf82ec&to=a4c6ebeb20168bbedbb1a3aff9f5096416e5914a&stat=instructions:u)
> 
> I reproduced huge time regression when invoking `-gen-global-isel` to generate `RISCVGenGlobalISel.inc`. The time went up from 4.8s to 16.6s

Does https://github.com/llvm/llvm-project/pull/101401 help?

https://github.com/llvm/llvm-project/pull/99657