[clang] [clang][Sema] Stop format size estimator upon %p to adapt to linux kernel's extension (PR #65969)

[Nick Desaulniers via cfe-commits]

nickdesaulniers wrote:

@nathanchance and I have done a bunch of testing of this revision (see comments https://github.com/ClangBuiltLinux/linux/issues/1923#issuecomment-1718144462 and down); this looks like something that will work nicely for the Linux kernel's use case! Thanks for all of the work here @hazohelet !

https://github.com/llvm/llvm-project/pull/65969