[clang] [Clang][Sema] fix outline member function template with default align crash (PR #78400)

[Qizhi Hu via cfe-commits]

https://github.com/jcsxky updated https://github.com/llvm/llvm-project/pull/78400

>From c3856543fd56ec33bab6bcdcd3d833c0e19f58f9 Mon Sep 17 00:00:00 2001
From: huqizhi <huqizhi at feysh.com>
Date: Wed, 17 Jan 2024 14:16:34 +0800
Subject: [PATCH] fix

---
 clang/lib/Sema/SemaTemplateInstantiate.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/clang/lib/Sema/SemaTemplateInstantiate.cpp b/clang/lib/Sema/SemaTemplateInstantiate.cpp
index fc80515b45e35b4..262fe71545a2a61 100644
--- a/clang/lib/Sema/SemaTemplateInstantiate.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiate.cpp
@@ -3064,10 +3064,18 @@ bool Sema::SubstDefaultArgument(
       if (addInstantiatedParametersToScope(FD, PatternFD, *LIS, TemplateArgs))
         return true;
     }
+    auto NewTemplateArgs = TemplateArgs;
+    if (FD->isOutOfLine()) {
+      auto *CurrentTemplateArgumentList = TemplateArgumentList::CreateCopy(
+          getASTContext(), TemplateArgs.getInnermost());
+      NewTemplateArgs = getTemplateInstantiationArgs(
+          FD, FD->getDeclContext(), true, CurrentTemplateArgumentList, true,
+          nullptr, false, false);
+    }
 
     runWithSufficientStackSpace(Loc, [&] {
-      Result = SubstInitializer(PatternExpr, TemplateArgs,
-                                /*DirectInit*/false);
+      Result = SubstInitializer(PatternExpr, NewTemplateArgs,
+                                /*DirectInit*/ false);
     });
   }
   if (Result.isInvalid())