Use MCJIT.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@213879 91177308-0d34-0410-b5e6-96231b3b80d8
Attempt at fixing the windows shared build.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@213881 91177308-0d34-0410-b5e6-96231b3b80d8