[interpreter] Fix debug stepping for generators.

src/interpreter/bytecode-array-builder.h

Index: src/interpreter/bytecode-array-builder.h
diff --git a/src/interpreter/bytecode-array-builder.h b/src/interpreter/bytecode-array-builder.h
index 3cdea52aae08488f00109c26786080664407301e..94347b9baf8aeed060eff93e1ce7d55574ca3928 100644
--- a/src/interpreter/bytecode-array-builder.h
+++ b/src/interpreter/bytecode-array-builder.h
@@ -261,9 +261,6 @@ class BytecodeArrayBuilder final : public ZoneObject {
   void SetExpressionPosition(Expression* expr);
   void SetExpressionAsStatementPosition(Expression* expr);
 
-  // Set position for return.
-  void SetReturnPosition();
-
   // Accessors
   TemporaryRegisterAllocator* temporary_register_allocator() {
     return &temporary_allocator_;
@@ -318,6 +315,9 @@ class BytecodeArrayBuilder final : public ZoneObject {
   // Attach latest source position to |node|.
   void AttachSourceInfo(BytecodeNode* node);
 
+  // Set position for return.
+  void SetReturnPosition();
+
   // Gets a constant pool entry for the |object|.
   size_t GetConstantPoolEntry(Handle<Object> object);