c15853ec3a
Reapply #152189 and #174963 which were reverted because it broke publish-sphinx-docs and publish-doxygen-docs. The build mode has been deprecated in #136314 and was supposed to be removed in the LLVM 21 release (#136314). OpenMP currently supports 4 build modes: * `cmake <llvm-project>/llvm -DLLVM_ENABLE_PROJECTS=openmp` * `cmake <llvm-project>/llvm -DLLVM_ENABLE_RUNTIMES=openmp` (bootstrapping build) * `cmake <llvm-project>/openmp` (standalone build) * `cmake <llvm-project>/runtimes -DLLVM_ENABLE_RUNTIMES=openmp` (runtimes default/standalone build) Each build mode increased the maintanance overhead since all build modes must continue working and user confusion when there do not (see #151117, #174126, #154117, ...). Let's finally remove it.
The LLVM Compiler Infrastructure
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