Fix test_conv_bn_fuse_pass_cc on Windows System (#49446)

* fix test_conv_bn_fuse_pass_cc

* remove comment

paddle/fluid/framework/ir/conv_bn_fuse_pass_tester.cc

@@ -32,7 +32,11 @@ void AddVarToScope(Scope* param_scope,
                    const DDim& dims) {
   auto* tensor = param_scope->Var(name)->GetMutable<phi::DenseTensor>();
   tensor->Resize(dims);
-  tensor->mutable_data<float>(platform::CPUPlace());
+  auto* data = tensor->mutable_data<float>(platform::CPUPlace());
+  int64_t numel = tensor->numel();
+  for (int64_t i = 0; i < numel; ++i) {
+    data[i] = 0;
+  }
 }
 
 Scope* CreateParamScope() {