[clang] [clang][Sema] Track trivial-relocatability as a type trait (PR #84621)

[via cfe-commits]

cor3ntin wrote:

> Do you mean that you would reject a proposal that adds Clang-specific trait (with another name) that implements P1144's semantics?

A proposal that explores trivial swapability for example, with the understanding it would be a subset of trivially relocatable types might be worth exploring as a separate feature. Hopefully this would go through careful design and RFC.

https://github.com/llvm/llvm-project/pull/84621