[test] Add libLTO as a clang test dependency on Darwin

[vsk]

Summary

Running 'check-clang' on a stock checkout of llvm+clang doesn't work on Darwin, because test/Driver/darwin-ld-lto.c can't find libLTO.dylib. Add libLTO as a clang test dependency on Darwin to fix the problem.

Note: We don't have this issue with check-all because libLTO is in the test-depends target.

[bruno]

Nice, LGTM

cfe/trunk/test/CMakeLists.txt

list(APPEND CLANG_TEST_DEPS
     opt
     )
 
   if(TARGET llvm-lto)
     list(APPEND CLANG_TEST_DEPS llvm-lto)
   endif()
 endif()
 
+if(APPLE)
+  list(APPEND CLANG_TEST_DEPS LTO)
+endif()
+
 add_custom_target(clang-test-depends DEPENDS ${CLANG_TEST_DEPS})
 set_target_properties(clang-test-depends PROPERTIES FOLDER "Clang tests")
 
 add_lit_testsuite(check-clang "Running the Clang regression tests"
   ${CMAKE_CURRENT_BINARY_DIR}
   #LIT ${LLVM_LIT}
   PARAMS ${CLANG_TEST_PARAMS}
   DEPENDS ${CLANG_TEST_DEPS}