Support argument passing simple, common, prototypes directly. More
complicated scenarios will require building up a stub function, which the
MC-JIT isn't set up to handle yet.
Add Intercept.cpp, which is just a copy from ExecutionEngine/JIT for now,
to handle looking looking up external symbol names. This probably more
properly belongs as part of RuntimeDyld. It'll migrate there as things
flesh out more fully.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128090 91177308-0d34-0410-b5e6-96231b3b80d8
