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remove dependence on CLOOG_FOUND for PollyVectorizerChoice
When polly was configured with cmake without cloog, compilation stopped with: ../tools/polly/lib/CodeGen/BlockGenerators.cpp:662: error: 'PollyVectorizerChoice' was not declared in this scope ../tools/polly/lib/CodeGen/BlockGenerators.cpp:662: error: 'VECTORIZER_FIRST_NEED_GROUPED_UNROLL' was not declared in this scope Merged from: https://llvm.org/svn/llvm-project/polly/trunk@168623 llvm-svn: 170736