When emitting member function pointers, use the canonical decl if the member function is virtual. Fixes PR5940.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@92680 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGenCXX/member-function-pointers.cpp b/test/CodeGenCXX/member-function-pointers.cpp
index 149b560..2454dda 100644
--- a/test/CodeGenCXX/member-function-pointers.cpp
+++ b/test/CodeGenCXX/member-function-pointers.cpp
@@ -128,3 +128,14 @@
   }
 }
 
+// PR5940
+namespace PR5940 {
+  class foo {
+  public:
+    virtual void baz(void);
+  };
+
+  void foo::baz(void) {
+       void (foo::*ptr)(void) = &foo::baz;
+  }
+}