Update for llvm api change.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@199327 91177308-0d34-0410-b5e6-96231b3b80d8
[PECOFF] Make export table tests readable.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@199409 91177308-0d34-0410-b5e6-96231b3b80d8