[clang] [TBAA] Emit distinct TBAA tags for pointers with different depths,types. (PR #76612)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

I don't see any issues with the code.  I'd prefer if we has a TYSan-instrumented bootstrap build of LLVM before we merge this, so we're confident this doesn't cause any unexpected issues.

https://github.com/llvm/llvm-project/pull/76612