The patch changes Buffer to Descriptors, changes
(UINT8 *Walker) to (EFI_MEMORY_DESCRIPTOR *Walker).
The change makes lots of type conversion unnecessary.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>