Do attempt to ask the impl_backend for the live address of a const result if none is stored in the object itself; this is for symmetry with GetAddressOf()

llvm-svn: 224143
diff --git a/lldb/source/Core/ValueObjectConstResultImpl.cpp b/lldb/source/Core/ValueObjectConstResultImpl.cpp
index 6df8b5c..7d94592 100644
--- a/lldb/source/Core/ValueObjectConstResultImpl.cpp
+++ b/lldb/source/Core/ValueObjectConstResultImpl.cpp
@@ -194,7 +194,7 @@
         return m_address_of_backend;
     }
     else
-        return lldb::ValueObjectSP();
+        return m_impl_backend->ValueObject::AddressOf(error);
 }
 
 lldb::addr_t