[llvm-branch-commits] Add deactivation symbol operand to ConstantPtrAuth. (PR #133537)

[Peter Collingbourne via llvm-branch-commits]

https://github.com/pcc created https://github.com/llvm/llvm-project/pull/133537

Deactivation symbol operands are supported in the code generator by
building on the previously added support for IRELATIVE relocations.

TODO:
- Fix broken test.
- Add bitcode and IR writer support.
- Add tests.