Fix ReplaceExprsInScope (#101)

Fix for issue #88

Author: tlemo

torch/csrc/jit/codegen/cuda/ir_base_nodes.h

@@ -261,7 +261,7 @@ class TORCH_CUDA_API Val : public Statement {
   const DataType dtype_;
 };
 
-class TORCH_CUDA_API Scope {
+struct TORCH_CUDA_API Scope {
  public:
   Scope() = default;
   Scope(const Scope* src, IrCloner* ir_cloner);

torch/csrc/jit/codegen/cuda/lower_utils.cpp

@@ -199,7 +199,7 @@ class CloneLoopNest : public OptOutMutator {
   }
 };
 
-class ReplaceExprsInScope : public OptOutDispatch {
+struct ReplaceExprsInScope : public OptOutDispatch {
  public:
   static void replace(
       Expr* scope,