[llvm-branch-commits] [RISC-V][MC] Introduce initial support RVY (CHERI) (PR #176871)

[Alexander Richardson via llvm-branch-commits]

arichardson wrote:

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This is a stacked pull request managed by [spr](https://github.com/spacedentist/spr). The following pull requests must be merged before this one:

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- #176870
- #177094
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https://github.com/llvm/llvm-project/pull/176871