Revert copy-constructor modification which causes TVM segfaults #666
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See #658
Unfortunately I don't have any more information on why this happens, but tvm is now blocked in updating dmlc-core. I had a unittest that could pass previously, but didn't pass after #658--but, a) I unfortunately lost it in auto-updating a submodule b) don't know if that was really the problem because most of these single-arg constructors aren't marked explicit.
cc @tqchen @mozga-intel @szha