diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -3307,7 +3307,7 @@
         Flags);
 
   const FunctionProtoType *FPT =
-      Ty->getPointeeType()->getAs<FunctionProtoType>();
+      Ty->getPointeeType()->castAs<FunctionProtoType>();
   return DBuilder.createMemberPointerType(
       getOrCreateInstanceMethodType(
           CXXMethodDecl::getThisType(FPT, Ty->getMostRecentCXXRecordDecl()),