[crossgen2] Promote single byref aot. (#65682)
* Rename `CORINFO_FLG_DONT_PROMOTE` to `CORINFO_FLG_DONT_DIG_FIELDS`. * Support promotion of `struct{ 1 gcref; }` outside of version bubble.
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* Rename `CORINFO_FLG_DONT_PROMOTE` to `CORINFO_FLG_DONT_DIG_FIELDS`. * Support promotion of `struct{ 1 gcref; }` outside of version bubble.