The truncation point for VL, when VLi is clear, must not include skipped
elements that preceded the current element being tested.
Example: `sz=0, VLi=0, predicate mask = 0b110010` and the Condition
-failure point is at element 4.
+Register failure point is at CR Field element 4.
* Testing at element 0 is skipped because its predicate bit is zero
* Testing at element 1 passed
* Testing elements 2 and 3 are skipped because their
respective predicate mask bits are zero
-* Testing element 4 fails therefore VL is truncated to **2**
+* Testing element 4 fails therefore VL is truncated to **2**
not 4 due to elements 2 and 3 being skipped.
If `sz=1` in the above example *then* VL would have been set to 4 because