Simplify blockwise broadcasting removing temporaries

Author: fdwr

index.bs

@@ -9722,13 +9722,9 @@ To <dfn data-lt="bidirectionally broadcasting">bidirectionally broadcast the sha
 To <dfn data-lt="blockwise broadcasting">blockwise broadcast the shapes</dfn> |shapeFrom| and |shapeTo|, perform the following steps. |shapeFrom| and |shapeTo| are [=/lists=] of positive integers, representing the dimensions of tensors, and the steps return a new [=/list=] of positive integers, or failure.
 </summary>
 
-1. Let |sizeFrom| be |shapeFrom|'s [=list/size=].
-1. Let |sizeTo| be |shapeTo|'s [=list/size=].
-1. If |sizeFrom| is not equal to |sizeTo|, then return failure.
-1. [=list/For each=] |index| in [=the range=] 0 to |sizeTo|, exclusive:
-    1. Let |dimFrom| be |shapeFrom|[|index|].
-    1. Let |dimTo| be |shapeTo|[|index|].
-    1. If |dimFrom| is not exactly divisible into |dimTo|, then return failure.
+1. If |shapeFrom|'s [=list/size=] is not equal to |shapeTo|'s [=list/size=], then return failure.
+1. [=list/For each=] |index| in [=the range=] 0 to |shapeTo|'s [=list/size=], exclusive:
+    1. If |shapeFrom|[|index|] is not exactly divisible into |shapeTo|[|index|], then return failure.
 1. Return |shapeTo|.
 
 </details>