Enable __declspec(selectany) on any platform

Summary:
This feature was disabled probably by mistake in rL300562
This fixes bug https://bugs.llvm.org/show_bug.cgi?id=33285

Reviewers: davide, rnk

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D33852

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@313278 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed