[llvm] [CHERI] Define CHERI capability address space in computeRISCVDataLayout (PR #190806)

[Owen Anderson via llvm-commits]

resistor wrote:

> Oh and the commit message should be updated to be something like "[RISC-V] Add support for cheriot ABI in DataLayout"

Done

https://github.com/llvm/llvm-project/pull/190806