An immediate of zero is a safety-valve to allow `LD-VSPLAT`:
in effect the multiplication of the immediate-offset by zero results
-in reading from the exact same memory location.
+in reading from the exact same memory location, *even with a Vector
+register*. (Normally this type of behaviour is reserved for the
+mapreduce modes)
For `LD-VSPLAT`, on non-cache-inhibited Loads, the read can occur
just the once and be copied, rather than hitting the Data Cache