[CMake] llvm_add_library: Add dependencies also to objlibs as workaround of CMake issue 14747.

http://www.cmake.org/Bug/view.php?id=14747

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201855 91177308-0d34-0410-b5e6-96231b3b80d8
[CMake] libLTO: Use (SHARED|STATIC) to build both shared LTO and LTO_static.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201856 91177308-0d34-0410-b5e6-96231b3b80d8