[llvm] [CHERI] Add a Support utility for determining alignment requirements of CHERI capabilities. (PR #197402)

[Owen Anderson via llvm-commits]

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resistor wrote:

In the original version I wasn't passing in the full type, only the width, so varying the return type wasn't possible. I'll experiment and see if it works out well now that the type is actually available.

https://github.com/llvm/llvm-project/pull/197402