[Offloading] [Bugfix] Fix disk offloading of models with explicit tensor dtypes (#46849)
* use meta tensor dtype
Signed-off-by: Kyle Sayers <kylesayrs@gmail.com>
* add test
Signed-off-by: Kyle Sayers <kylesayrs@gmail.com>
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Signed-off-by: Kyle Sayers <kylesayrs@gmail.com>