Fix for b/405045790.

--- a/lib/Dialect/TritonGPU/Transforms/AccelerateMatmul.cpp
+++ b/lib/Dialect/TritonGPU/Transforms/AccelerateMatmul.cpp
@@ -361,9 +361,12 @@ static bool bwdFilter(Operation *op) {
       return false;
   }
 
+  // b/405045790: We don't want to propagate through the BroadcastOp because we
+  // probably don't care about the load before a broadcast as it would likely be
+  // small. This is just a heuristic to avoid a regression.
   return (op->hasTrait<OpTrait::Elementwise>() && isMemoryEffectFree(op)) ||
          isView(op) ||
-         isa<Fp4ToFpOp, LoadOp, DescriptorLoadLikeOpInterface, BroadcastOp,
+         isa<Fp4ToFpOp, LoadOp, DescriptorLoadLikeOpInterface,/*BroadcastOp,*/
              ConvertLayoutOp>(op);
 }