[clang] [BoundsSafety] Allow 'counted_by' attribute on pointers in structs in C (PR #90786)

[Bill Wendling via cfe-commits]

bwendling wrote:

This seems to have broken the Linux build:

https://github.com/llvm/llvm-project/commit/0ec3b972e58bcbcdc1bebe1696ea37f2931287c3 breaks the build for Linux, added by https://git.kernel.org/linus/781d41fed19caf900c8405064676813dc9921d32:

https://paste.debian.net/plainh/b192bcd1

https://github.com/llvm/llvm-project/pull/90786