[llvm] [InstrProf][X86] Set code model for counters global variables (PR #77986)

[Fangrui Song via llvm-commits]

https://github.com/MaskRay approved this pull request.

IIUC when mixing -mcmodel=small and -mcmodel=large object files, the counter section will cause an lld warning if we take https://github.com/llvm/llvm-project/pull/72335 . This makes me nervous about the lld change.

However, setting the code model for counter variables is right.

https://github.com/llvm/llvm-project/pull/77986