[cmake] Include openmp with add_llvm_external_project
Summary:
Include projects/openmp into the build using add_llvm_external_project
instead of add_subdirectory. This creates an option
LLVM_TOOL_OPENMP_BUILD that selects whether this project gets included
in an in-tree build.
Reviewers: beanz, AndreyChurbanov, jlpeyton
Subscribers: srhines, openmp-commits, llvm-commits, mgorny
Differential Revision: https://reviews.llvm.org/D30470
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297185
91177308-0d34-0410-b5e6-
96231b3b80d8
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