[clang] [clang] Add builtin_get_vtable_pointer and virtual_member_address (PR #135469)

[Oliver Hunt via cfe-commits]

ojhunt wrote:

> I'm confused -- how is there existing code depending on a builtin which doesn't yet exist in Clang? Are we copying these builtins from somewhere else?

This is part of the pointer authentication support we are upstreaming, all of which has been in use for a long time, just not available in upstream llvm/clang.

https://github.com/llvm/llvm-project/pull/135469