[llvm] [DAG] shouldReduceLoadWidth - add optional<unsigned> byte offset argument (PR #136723)

[Matt Arsenault via llvm-commits]

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@@ -1824,8 +1824,10 @@ class TargetLoweringBase {
 
   /// Return true if it is profitable to reduce a load to a smaller type.
   /// Example: (i16 (trunc (i32 (load x))) -> i16 load x
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arsenm wrote:

Better comment the ByteOffset argument? 

https://github.com/llvm/llvm-project/pull/136723