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

[Xi Ruoyao via cfe-commits]

xry111 wrote:

> is it too late to change the gcc attribute name?

It has been released in GCC 13, and GCC 14 is in stage 3 so a change must be deferred into GCC 15.  And the kernel code already relies on it.  So a change will render all previous kernel releases impossible to build with GCC 13/14.

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