[yaml2obj] - Allow to use numeric sh_link (Link) value for sections.

That change allows using numeric values for Link field.
It is consistent with the code for another fields in this method.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@339873 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed