In a standalone Clang build, default to building tests, like LLVM does

LLVM_INCLUDE_TESTS is set in the top-level LLVM CMakeLists, which is not being
executed when Clang is built in a separate directory.

llvm-svn: 197423
GitOrigin-RevId: f7d23ff1a6c66f228d3dde796d50096a47d3fcb5
1 file changed