[NFC][CLANG] Fix bug with dereference null return value in GetFunctionTypeForVTable()

This patch uses castAs instead of getAs which will assert if the type doesn't match in clang::CodeGen::CodeGenTypes::GetFunctionTypeForVTable(clang::GlobalDecl).

Reviewed By: erichkeane

Differential Revision: https://reviews.llvm.org/D151957

diff --git a/clang/lib/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp
index 09ccb63..b6b04fc 100644 (file)
--- a/clang/lib/CodeGen/CGCall.cpp
+++ b/clang/lib/CodeGen/CGCall.cpp
@@ -1751,7 +1751,7 @@ CodeGenTypes::GetFunctionType(const CGFunctionInfo &FI) {
 
 llvm::Type *CodeGenTypes::GetFunctionTypeForVTable(GlobalDecl GD) {
   const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
-  const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
+  const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
 
   if (!isFuncTypeConvertible(FPT))
     return llvm::StructType::get(getLLVMContext());