Implement taking address of member functions, including overloaded ones.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63779 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index 66cbdfd..6671037 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -3498,11 +3498,18 @@
       }
     } else if (isa<FunctionDecl>(dcl)) {
       // Okay: we can take the address of a function.
+      // As above.
+      if (isa<QualifiedDeclRefExpr>(op)) {
+        DeclContext *Ctx = dcl->getDeclContext();
+        if (Ctx && Ctx->isRecord())
+          return Context.getMemberPointerType(op->getType(),
+                Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr());
+      }
     }
     else
       assert(0 && "Unknown/unexpected decl type");
   }
-  
+
   // If the operand has type "type", the result has type "pointer to type".
   return Context.getPointerType(op->getType());
 }