This reapplies r281304. The issue was that I had missed
to copy the new isAdd field in the tablegen data structure.

llvm-svn: 281447
diff --git a/llvm/utils/TableGen/CodeGenInstruction.h b/llvm/utils/TableGen/CodeGenInstruction.h
index 8e5a03d..75db17b 100644
--- a/llvm/utils/TableGen/CodeGenInstruction.h
+++ b/llvm/utils/TableGen/CodeGenInstruction.h
@@ -230,6 +230,7 @@
     bool isSelect : 1;
     bool isBarrier : 1;
     bool isCall : 1;
+    bool isAdd : 1;
     bool canFoldAsLoad : 1;
     bool mayLoad : 1;
     bool mayLoad_Unset : 1;