[CMake] Re-apply r200765, "Get rid of llvm_config() to expand dependencies."

CMake's target_link_libraries() will manage dependencies with Brad's LLVMConfig improvements.

Configuration time may be reduced by a few seconds.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201062 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed