[clang] Thread Safety Analysis: Improved pointer handling (PR #127396)

[Marco Elver via cfe-commits]

melver wrote:

FWIW, I'm ready for sending a v2 series to the Linux kernel mailing list: https://git.kernel.org/pub/scm/linux/kernel/git/melver/linux.git/log/?h=cap-analysis/dev

But I'd like to sort out this PR first before sending the v2 series.

https://github.com/llvm/llvm-project/pull/127396