Constrain __bind functor constructor such that it won't accidentally get used as a copy constructor from a non-const lvalue. Fixes <rdar://problem/11359080>. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@156182 91177308-0d34-0410-b5e6-96231b3b80d8 
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