[clang] [CMake][Release] Disable PGO (PR #88465)

[via cfe-commits]

llvmbot wrote:

<!--IGNORE-->
Failed to cherry-pick: 0d2bb7f017f13ceae793fab7d83d3e67e8d8d8f8)

https://github.com/llvm/llvm-project/actions/runs/8668528827

Please manually backport the fix and push it to your github fork.  Once this is done, please create a [pull request](https://github.com/llvm/llvm-project/compare)

https://github.com/llvm/llvm-project/pull/88465