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

[Pengcheng Wang via llvm-commits]

wangpc-pp wrote:

Why are there decreases of total bytes and memory usage? I suppose it should increase?
And please print a comment about the real MVT name since we miss it after VBR encoding.

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