Add T to PhantomData impl Debug
This add debug information for `PhantomData`, I believe it's make sense to add this to debug impl of `PhantomData` since `T` is what define what is the `PhantomData` just write `"PhantomData"` is not very useful for debugging.
Alternative:
* `PhantomData::<{}>`
* `PhantomData { t: "str_type" }`
`@rustbot` label +T-libs-api -T-libs
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