Fix build errors LLVM tests are disabled.
Original patch from alanbaker@google.com
Fixes the error:
CMake Error in <...>/llvm/cmake/modules/CMakeLists.txt:
export called with target "LLVMTestingSupport" which requires target
"gtest" that is not in the export set.
This occurs when LLVM is embedded in a larger project, but is configured not to
include tests. If testing is disabled gtest isn't available and LLVM fails to
configure.
Differential revision: https://reviews.llvm.org/D63097
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@365836
91177308-0d34-0410-b5e6-
96231b3b80d8
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