Back out of GPU Codegen if NVPTX is not available
Summary: When enabling GPU codegen in polly, CMake will fail if NVPTX is not a target supported by the LLVM polly is being built against. In that case, GPU codegen should be switched off. Reviewers: Meinersbur, grosser, bollu Reviewed By: Meinersbur Subscribers: mgorny, bollu, pollydev, llvm-commits Differential Revision: https://reviews.llvm.org/D47888 llvm-svn: 334233
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