Place back previous order of add_subdirectory()'s to reflect build depedencies.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@137117 91177308-0d34-0410-b5e6-96231b3b80d8

tools/CMakeLists.txt

@@ -1,6 +1,6 @@
+add_subdirectory(libclang)
+add_subdirectory(c-index-test)
 add_subdirectory(arcmt-test)
 add_subdirectory(c-arcmt-test)
-add_subdirectory(c-index-test)
 add_subdirectory(diagtool)
 add_subdirectory(driver)
-add_subdirectory(libclang)