[llvm] [CodeGen, CHERI] Add capability types to MVT. (PR #156616)

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

Can the new types be useful for other targets with similar architectural features? If so, I think it makes sense to give them more sensible names. Otherwise the term should be explained somewhere, as the current name does not give a clue that it is just a flavor of a pointer.


https://github.com/llvm/llvm-project/pull/156616