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[AMDGPU] NFC. Assert that mask is full with VOPC DPP
VOPC DPP should not be formed when the row_mask and bank_mask are not 0xf (full) because the resulting VOP DPP would have different semantics than the MOV DPP followed by VOP. Existing checks in GCNDPPCombine cover this case but for different reasons, so assert the property for future-proofing. Reviewed By: nhaehnle Differential Revision: https://reviews.llvm.org/D130101
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