[CINN] Fix horizontal fusion with empty loop (#71550) (#71574)

* [CINN] Fix horizontal fusion with empty loop

* update

Author: huangjiyi

paddle/cinn/operator_fusion/pattern_fuser.h

@@ -365,6 +365,7 @@ static bool IsLoopFrameworkEqual(const StmtPattern& lhs,
   const auto& rhs_loops = GetLoopFramework(rhs);
   VLOG(4) << "lhs " << lhs_loops.DebugStr();
   VLOG(4) << "rhs " << rhs_loops.DebugStr();
+  if (lhs_loops.loop.empty() || rhs_loops.loop.empty()) return false;
 
   // TODO(huangjiyi): support horizontal fusion without reduce dims equal.
   const auto get_reduce_loop = [](const MaybeLoopFramework& loop) {

paddle/cinn/operator_fusion/pir_graph_analyzing/loop_axis_mapping.cc

@@ -563,7 +563,7 @@ LoopAxisMapping CreateLoopAxisMappingForReshape(pir::Operation* op) {
   result.output_values.push_back(op->result(0));
   result.loop2output.resize(1);
   auto in_shape = GetCompatibleValueAllDims(op->operand_source(0));
-  auto out_shape = GetValueAllDims(op->result(0));
+  auto out_shape = GetCompatibleValueAllDims(op->result(0));
   result.loop = out_shape;
 
   if (!ShapeProductEqual(in_shape, out_shape)) {