[llvm] [VPlan] Simplify BLEND %a, %b, NOT(%m) -> BLEND %b, %a, %m. (PR #128375)

[Florian Hahn via llvm-commits]

================
@@ -71,7 +71,7 @@ for.end:
 
 ;CHECK-LABEL: @reduction_func(
 ;CHECK: load <4 x i32>
-;CHECK: icmp slt <4 x i32>
+;CHECK: icmp sgt <4 x i32>
----------------
fhahn wrote:

This is due to missing checking the operands. 

Previously we had `icmp slt  ... 31`, now we have `icmp sgt i32 ... 30`

https://github.com/llvm/llvm-project/pull/128375