Object: Factor out the code for creating the irsymtab for an arbitrary bitcode file.

This code now lives in lib/Object. The idea is that it can now be reused by
IRObjectFile among other things.

Differential Revision: https://reviews.llvm.org/D31921

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304958 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed