Function LLVMOrcCreateInstance 

pub unsafe extern "C" fn LLVMOrcCreateInstance(
    TM: *mut LLVMOpaqueTargetMachine,
) -> *mut LLVMOrcOpaqueJITStack

Create an ORC JIT stack.

The client owns the returned stack and must call OrcDisposeInstance when done with it. The JIT stack takes ownership of the provided TargetMachine.