Add missing include

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189448 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/SequenceToOffsetTable.h b/utils/TableGen/SequenceToOffsetTable.h
index fcda233..e6ab664 100644
--- a/utils/TableGen/SequenceToOffsetTable.h
+++ b/utils/TableGen/SequenceToOffsetTable.h
@@ -21,6 +21,7 @@
 #include <cassert>
 #include <cctype>
 #include <functional>
+#include <map>
 #include <vector>
 
 namespace llvm {