CGVTables - silence static analyzer getAs<FunctionProtoType> null dereference warnings. NFCI.

The static analyzer is warning about potential null dereferences, but we should be able to use castAs<FunctionProtoType> directly and if not assert will fire for us.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@373398 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGVTables.cpp

@@ -157,7 +157,7 @@ CodeGenFunction::GenerateVarArgsThunk(llvm::Function *Fn,
                                       const CGFunctionInfo &FnInfo,
                                       GlobalDecl GD, const ThunkInfo &Thunk) {
   const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
-  const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
+  const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
   QualType ResultType = FPT->getReturnType();
 
   // Get the original function
@@ -242,7 +242,6 @@ void CodeGenFunction::StartThunk(llvm::Function *Fn, GlobalDecl GD,
   // Build FunctionArgs.
   const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
   QualType ThisType = MD->getThisType();
-  const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>();
   QualType ResultType;
   if (IsUnprototyped)
     ResultType = CGM.getContext().VoidTy;
@@ -251,7 +250,7 @@ void CodeGenFunction::StartThunk(llvm::Function *Fn, GlobalDecl GD,
   else if (CGM.getCXXABI().hasMostDerivedReturn(GD))
     ResultType = CGM.getContext().VoidPtrTy;
   else
-    ResultType = FPT->getReturnType();
+    ResultType = MD->getType()->castAs<FunctionProtoType>()->getReturnType();
   FunctionArgList FunctionArgs;
 
   // Create the implicit 'this' parameter declaration.