[llvm] [TableGen, CodeGen, CHERI] Add support for the cPTR wildcard value type. (PR #158426)

[Jessica Clarke via llvm-commits]

jrtc27 wrote:

cPTR shouldn’t be any more of a real value type than iPTR. Presumably somewhere in the auto generation it’s being fed the wrong information about whether cPTR is real or tablegen-internal?

https://github.com/llvm/llvm-project/pull/158426