Add support for the convergent flag at the MC and MachineInstr levels.

llvm-svn: 238450
diff --git a/llvm/utils/TableGen/CodeGenInstruction.h b/llvm/utils/TableGen/CodeGenInstruction.h
index bdbe546..90ccee3 100644
--- a/llvm/utils/TableGen/CodeGenInstruction.h
+++ b/llvm/utils/TableGen/CodeGenInstruction.h
@@ -255,6 +255,7 @@
     bool isRegSequence : 1;
     bool isExtractSubreg : 1;
     bool isInsertSubreg : 1;
+    bool isConvergent : 1;
 
     std::string DeprecatedReason;
     bool HasComplexDeprecationPredicate;