Improve efficiency of trivial toDelim calls
Summary: `toDelim` with a single parameter of the same type as the target type was previously copy-constructing its result. It will now construct it with perfect forwarding which is more efficient if the input is a temporary. This brings `toDelim` into line with the similar implementations of `to` and `tryTo` Reviewed By: yfeldblum Differential Revision: D5301427 fbshipit-source-id: 843a2d93384de88cce42f26da6562a1a6ed0dc9c
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