Add a forward decl, oops.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@573 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/InstrSched/SchedGraph.h b/lib/CodeGen/InstrSched/SchedGraph.h
index e12d90f..35cdfd2 100644
--- a/lib/CodeGen/InstrSched/SchedGraph.h
+++ b/lib/CodeGen/InstrSched/SchedGraph.h
@@ -33,6 +33,7 @@
 class SchedGraphNode; 
 class SchedGraph; 
 class NodeToRegRefMap;
+class MachineInstr;
 
 /******************** Exported Data Types and Constants ********************/