[clang] [llvm] [openmp] [OpenMP][offload] Fix dynamic schedule tracking (PR #97065)

[Martin Storsjö via cfe-commits]

mstorsjo wrote:

This change broke Windows builds of OpenMP.  Building succeed, but many build scenarios fail due to `__kmpc_dispatch_deinit` being undefined. It looks like it only is defined in the OpenMP device offload library, but is missing if the offload library isn't being built/used.

See e.g. https://github.com/mstorsjo/llvm-mingw/actions/runs/9753150440/job/26926642868#step:8:801 for an example of a failed OpenMP test run.

https://github.com/llvm/llvm-project/pull/97065