Apply feedback from previous patch.

llvm-svn: 41774
diff --git a/llvm/tools/llvm-upgrade/UpgradeParser.y.cvs b/llvm/tools/llvm-upgrade/UpgradeParser.y.cvs
index bc6342c..211934f 100644
--- a/llvm/tools/llvm-upgrade/UpgradeParser.y.cvs
+++ b/llvm/tools/llvm-upgrade/UpgradeParser.y.cvs
@@ -2525,6 +2525,7 @@
     if ($1.T==Type::FloatTy)
       $2->convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven);
     $$.C = ConstantFP::get($1.T, *$2);
+    delete $2;
     $$.S.makeSignless();
   }
   ;