struct Init -> class Init

Rename struct Init to class Init for consistency and in preparation
for making Init a FoldingSetNode.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135097 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/CodeGenDAGPatterns.h b/utils/TableGen/CodeGenDAGPatterns.h
index e4e8574..936fd01 100644
--- a/utils/TableGen/CodeGenDAGPatterns.h
+++ b/utils/TableGen/CodeGenDAGPatterns.h
@@ -26,7 +26,7 @@
 
 namespace llvm {
   class Record;
-  struct Init;
+  class Init;
   class ListInit;
   class DagInit;
   class SDNodeInfo;