[clang] [clang] Add per-global code model attribute (PR #72078)

[Reid Kleckner via cfe-commits]

rnk wrote:

Here's a [GCC doc link](https://gcc.gnu.org/onlinedocs/gcc/IA-64-Variable-Attributes.html). I think matching GCC is sufficient motivation for me, I just didn't see it mentioned.

https://github.com/llvm/llvm-project/pull/72078