nir/lower_memcpy: Don't mask the store
For constant-size memcpys, we can do as much as a vec4 at a time. We were accidentally masking the store to only the .x component.
Fixes: a3177cca "nir: Add a lowering pass to lower memcpy"
For constant-size memcpys, we can do as much as a vec4 at a time. We were accidentally masking the store to only the .x component.
Fixes: a3177cca "nir: Add a lowering pass to lower memcpy"