[Cmake] Add an option to build LLVM using the experimental new pass manager

Add LLVM_USE_NEWPM to build LLVM using the experimental new pass manager.

Differential Revision: http://reviews.llvm.org/D57068


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353550 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed