[PATCH] Add support for "fancy" pointers to shared_ptr. Fixes PR20616

[Marshall Clow]

================
Comment at: test/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_no_variadics.pass.cpp:114
@@ +113,3 @@
+
+    test<bare_allocator<void>>();
+#if __cplusplus >= 201103L
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This fails on C++03. Please add a space between the two closing angle brackets.

http://reviews.llvm.org/D4859