[OpenMP] Add target to build OpenMP runtime (#189557) This adds a top-level target to build the OpenMP runtime, similar to what was done in https://github.com/llvm/llvm-project/pull/186099 for the Offload runtime. Having this top-level target enables us to execute the build in the pre-commit CI as shown in https://github.com/llvm/llvm-project/pull/174955 (I actually just cherry-picked the commit from that branch)
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