MLBEDSW-11244 Fix GraphIrOptimiser::RewriteCast
Fixed an issue where we tried to get the data type of a tensor which had already been released by the operation.
Change-Id: Iea0e3966051d52e576b996f9bf0d4f4de44dbed3 Signed-off-by: Fredrik Svedberg fredrik.svedberg@arm.com