Unbreak VC++ build.

llvm-svn: 31464
diff --git a/llvm/utils/TableGen/CodeGenInstruction.h b/llvm/utils/TableGen/CodeGenInstruction.h
index c5b4c3c..e1c4c7d 100644
--- a/llvm/utils/TableGen/CodeGenInstruction.h
+++ b/llvm/utils/TableGen/CodeGenInstruction.h
@@ -23,7 +23,8 @@
   class Record;
   class DagInit;
 
-  struct CodeGenInstruction {
+  class CodeGenInstruction {
+  public:
     Record *TheDef;            // The actual record defining this instruction.
     std::string Name;          // Contents of the 'Name' field.
     std::string Namespace;     // The namespace the instruction is in.