Update for llvm api change.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@212407 91177308-0d34-0410-b5e6-96231b3b80d8
[Mips] Make rel-dynamic-04.test test case independent from external input files.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@212409 91177308-0d34-0410-b5e6-96231b3b80d8