[CMake] LLVM-Config.cmake: Split explicit_map_components_to_libraries and introduce llvm_map_components_to_libnames and llvm_expand_dependencies.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200764 91177308-0d34-0410-b5e6-96231b3b80d8
[CMake] Get rid of llvm_config() to expand dependencies.

CMake's target_link_libraries() will manage dependencies.

Configuration time may be reduced by a few seconds.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200765 91177308-0d34-0410-b5e6-96231b3b80d8
Implemented support for Process::GetRandomNumber on Windows.

Patch thanks to Stephan Tolksdorf!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200767 91177308-0d34-0410-b5e6-96231b3b80d8