[CMAKE] fix LLVM_OPTIMIZED_TABLEGEN for Visual Studio
At the moment optimized tablegen is generated by LLVM_USE_HOST_TOOLS variable that is not set for Visual Sudio since LLVM_ENABLE_ASSERTIONS depends on CMAKE_BUILD_TYPE value that is not equal to "DEBUG" in case of Visual Studio soltion generation.
Modified to do not depend on LLVM_ENABLE_ASSERTIONS value in VS and Xcode cases
Reviewers: beanz
Subscribers: RKSimon, llvm-commits, mgorny
Differential Revision: https://reviews.llvm.org/D27135
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288042
91177308-0d34-0410-b5e6-
96231b3b80d8
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