Fix virtual destructor mangling when using "-cxx-abi microsoft" on x64

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@189214 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/MicrosoftMangle.cpp b/lib/AST/MicrosoftMangle.cpp
index d9e18eb..cb93f07 100644
--- a/lib/AST/MicrosoftMangle.cpp
+++ b/lib/AST/MicrosoftMangle.cpp
@@ -1294,7 +1294,7 @@
       // However, the FunctionType generated has 0 arguments.
       // FIXME: This is a temporary hack.
       // Maybe should fix the FunctionType creation instead?
-      Out << "PAXI@Z";
+      Out << (PointersAre64Bit ? "PEAXI@Z" : "PAXI@Z");
       return;
     }
     Out << '@';