[ORC] Replace some more 'auto' uses with std::error_code.

One of the GCC 4.7 bots doesn't seem to like auto, and is currently suffering
from an ICE. I'm hoping this will help.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257454 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed