[clang] [CIR]lAdd name for function type in vtable (PR #163839)

[via cfe-commits]

https://github.com/y-Adrian created https://github.com/llvm/llvm-project/pull/163839

This commit adds the RTTI support for function type in the vtable.

Issue https://github.com/llvm/llvm-project/issues/163601

>From d7a38e20f3998fab4d1353b0d86e528a1f428317 Mon Sep 17 00:00:00 2001
From: Adrian <zhaoxu7263 at 163.com>
Date: Fri, 17 Oct 2025 01:56:33 +0800
Subject: [PATCH] [CIR]llvm#163601:handle function type

---
 clang/lib/CIR/CodeGen/CIRGenItaniumCXXABI.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/clang/lib/CIR/CodeGen/CIRGenItaniumCXXABI.cpp b/clang/lib/CIR/CodeGen/CIRGenItaniumCXXABI.cpp
index 1b85a530cbdd7..44919de69ae8e 100644
--- a/clang/lib/CIR/CodeGen/CIRGenItaniumCXXABI.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenItaniumCXXABI.cpp
@@ -946,8 +946,7 @@ const char *vTableClassNameForType(const CIRGenModule &cgm, const Type *ty) {
 
   case Type::FunctionNoProto:
   case Type::FunctionProto:
-    cgm.errorNYI("VTableClassNameForType: __function_type_info");
-    break;
+    return "__ZTSN10__cxxabiv120__function_type_infoE";
 
   case Type::Enum:
     cgm.errorNYI("VTableClassNameForType: Enum");