`MaskedPrototype` is used nowhere, by context and symmetry it should be used by where this commit edits. The existing code is doing fine because the default policy for unmasked intrinsics are set to TAMU. This is something to be fixed because if the default policy is TAMA, the code will be incorrect. Depends on D141762.

`MaskedPrototype` is initialized and used nowhere, by context and symmetry it should be used by where this commit edits. The existing code is doing fine because the default policy for unmasked intrinsics are set to TAMU. This is something to be fixed because if the default policy is TAMA, the code will be incorrect. Depends on D141762.

`MaskedPrototype` is initialized and used nowhere, by context and symmetry it should be should be used by where this commit edits. The existing code is doing fine because the default policy for unmasked intrinsics are set to TAMU. This is something to be fixed because if the default policy is TAMA, the code will be incorrect. Depends on D141762.