[PECOFF] Use richer ways of describing auxiliary symbols

Update all of the unit tests to use the new format.

This depends on D3092.

Reviewers: ruiu

Differential Revision: http://llvm-reviews.chandlerc.com/D3093

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@204215 91177308-0d34-0410-b5e6-96231b3b80d8