[CMake] Move ninja job pool options to HandleLLVMOptions

Moving the Ninja job pool configuration settings into the HandleLLVMOptions module will allow standalone builds of LLVM sub-projects to use the LLVM options without needing to re-implement them.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294334 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed