[globalisel] Fix missing break.

The instruction selector has been emitting the register bank information too.

llvm-svn: 294007
diff --git a/llvm/utils/TableGen/TableGen.cpp b/llvm/utils/TableGen/TableGen.cpp
index c9a818e..6937f20 100644
--- a/llvm/utils/TableGen/TableGen.cpp
+++ b/llvm/utils/TableGen/TableGen.cpp
@@ -185,6 +185,7 @@
     break;
   case GenGlobalISel:
     EmitGlobalISel(Records, OS);
+    break;
   case GenRegisterBank:
     EmitRegisterBank(Records, OS);
     break;