[AddressSpace] Use the macro to set hidden visibility on LocalAddressSpace.

Summary:
That attribute has no effect on Windows anyway--classes are hidden by
default.

Reviewers: mstorsjo, rnk

Subscribers: christof, cfe-commits

Differential Revision: https://reviews.llvm.org/D51509

git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@341210 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed