[clang] [WIP] Try to fix GH73418 (PR #79568)

[Younan Zhang via cfe-commits]

https://github.com/zyn0217 created https://github.com/llvm/llvm-project/pull/79568

For the purpose of poking the libc++ CI.

>From 212a4efbc65c437f652dc08c75ed4a836167fe70 Mon Sep 17 00:00:00 2001
From: Younan Zhang <zyn7109 at gmail.com>
Date: Fri, 26 Jan 2024 18:03:37 +0800
Subject: [PATCH] [clang][Sema] fixup

---
 clang/lib/Sema/SemaConcept.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/clang/lib/Sema/SemaConcept.cpp b/clang/lib/Sema/SemaConcept.cpp
index acfc00f41254074..3d77125106b05d1 100644
--- a/clang/lib/Sema/SemaConcept.cpp
+++ b/clang/lib/Sema/SemaConcept.cpp
@@ -612,8 +612,10 @@ bool Sema::SetupConstraintScope(
 
     // If this is a member function, make sure we get the parameters that
     // reference the original primary template.
-    if (const auto *FromMemTempl =
-            PrimaryTemplate->getInstantiatedFromMemberTemplate()) {
+    for (FunctionTemplateDecl *FromMemTempl =
+             PrimaryTemplate->getInstantiatedFromMemberTemplate();
+         FromMemTempl;
+         FromMemTempl = FromMemTempl->getInstantiatedFromMemberTemplate()) {
       if (addInstantiatedParametersToScope(FD, FromMemTempl->getTemplatedDecl(),
                                            Scope, MLTAL))
         return true;