[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
diff --git a/src/AddressSpace.hpp b/src/AddressSpace.hpp
index 32e66bb..30ad359 100644
--- a/src/AddressSpace.hpp
+++ b/src/AddressSpace.hpp
@@ -180,7 +180,7 @@
 /// LocalAddressSpace is used as a template parameter to UnwindCursor when
 /// unwinding a thread in the same process.  The wrappers compile away,
 /// making local unwinds fast.
-class __attribute__((visibility("hidden"))) LocalAddressSpace {
+class _LIBUNWIND_HIDDEN LocalAddressSpace {
 public:
   typedef uintptr_t pint_t;
   typedef intptr_t  sint_t;