[CMake] Move CLANG_INCLUDE_TESTS in advance of add_subdirectory(tools).

The target "check-clang-tools" is affected by CLANG_INCLUDE_TESTS but it was undefined in 1st configuration procedure.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@249283 91177308-0d34-0410-b5e6-96231b3b80d8

CMakeLists.txt

@@ -490,6 +490,10 @@ set(LIBCLANG_LIBRARY_VERSION
     "Version number that will be placed into the libclang library , in the form XX.YY")
 mark_as_advanced(CLANG_EXECUTABLE_VERSION LIBCLANG_LIBRARY_VERSION)
 
+option(CLANG_INCLUDE_TESTS
+       "Generate build targets for the Clang unit tests."
+       ${LLVM_INCLUDE_TESTS})
+
 add_subdirectory(utils/TableGen)
 
 add_subdirectory(include)
@@ -510,10 +514,6 @@ else()
 endif()
 add_subdirectory(examples)
 
-option(CLANG_INCLUDE_TESTS
-       "Generate build targets for the Clang unit tests."
-       ${LLVM_INCLUDE_TESTS})
-
 if( CLANG_INCLUDE_TESTS )
   if(EXISTS ${LLVM_MAIN_SRC_DIR}/utils/unittest/googletest/include/gtest/gtest.h)
     add_subdirectory(unittests)