[llvm] [TableGen][GlobalISel] Specialize more MatchTable Opcodes (PR #89736)

[Pierre van Houtryve via llvm-commits]

Pierre-vh wrote:

> Is the table still emitting everything as uint64_t? Is it time to fix that?

No, it's a byte table now with most things using a flexible encoding (ULEB) or fixed-size encoding between 2 and 8 bytes if we can't do ULEB (e.g. value not known)

https://github.com/llvm/llvm-project/pull/89736