[Offload] Only issue a warning for building `offload` on the GPU and return (#179240) Summary: Right now this will fail because the GPU architectures will attempt to build all of `offload` with the GPU, which obviously won't work. In the future we will proably have some utility library that we will route through this, but for now just silently return. This is useful because the documentation states to use this, but it doesn't work right now. ``` -DLLVM_ENABLE_RUNTIMES=offload;openmp -DLLVM_RUNTIME_TARGETS=default;amdgcn-amd-amdhsa ``` This PR makes this work.
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