[clang] [clang][Index] Use HeuristicResolver in IndexTypeSourceInfo as well (PR #128106)

[Nathan Ridge via cfe-commits]

https://github.com/HighCommander4 created https://github.com/llvm/llvm-project/pull/128106

None

>From 10edf87574f5473da01bd985cec4c7810f57c516 Mon Sep 17 00:00:00 2001
From: Nathan Ridge <zeratul976 at hotmail.com>
Date: Thu, 20 Feb 2025 20:44:52 -0500
Subject: [PATCH] [clang][Index] Use HeuristicResolver in IndexTypeSourceInfo
 as well

---
 clang/lib/Index/IndexTypeSourceInfo.cpp | 24 +++---------------------
 1 file changed, 3 insertions(+), 21 deletions(-)

diff --git a/clang/lib/Index/IndexTypeSourceInfo.cpp b/clang/lib/Index/IndexTypeSourceInfo.cpp
index b986ccde57452..d5d0a3c422871 100644
--- a/clang/lib/Index/IndexTypeSourceInfo.cpp
+++ b/clang/lib/Index/IndexTypeSourceInfo.cpp
@@ -11,6 +11,7 @@
 #include "clang/AST/PrettyPrinter.h"
 #include "clang/AST/RecursiveASTVisitor.h"
 #include "clang/AST/TypeLoc.h"
+#include "clang/Sema/HeuristicResolver.h"
 #include "llvm/ADT/ScopeExit.h"
 
 using namespace clang;
@@ -207,27 +208,8 @@ class TypeIndexer : public RecursiveASTVisitor<TypeIndexer> {
   }
 
   bool VisitDependentNameTypeLoc(DependentNameTypeLoc TL) {
-    const DependentNameType *DNT = TL.getTypePtr();
-    const NestedNameSpecifier *NNS = DNT->getQualifier();
-    const Type *T = NNS->getAsType();
-    if (!T)
-      return true;
-    const TemplateSpecializationType *TST =
-        T->getAs<TemplateSpecializationType>();
-    if (!TST)
-      return true;
-    TemplateName TN = TST->getTemplateName();
-    const ClassTemplateDecl *TD =
-        dyn_cast_or_null<ClassTemplateDecl>(TN.getAsTemplateDecl());
-    if (!TD)
-      return true;
-    CXXRecordDecl *RD = TD->getTemplatedDecl();
-    if (!RD->hasDefinition())
-      return true;
-    RD = RD->getDefinition();
-    DeclarationName Name(DNT->getIdentifier());
-    std::vector<const NamedDecl *> Symbols = RD->lookupDependentName(
-        Name, [](const NamedDecl *ND) { return isa<TypeDecl>(ND); });
+    std::vector<const NamedDecl *> Symbols =
+        IndexCtx.getResolver()->resolveDependentNameType(TL.getTypePtr());
     if (Symbols.size() != 1)
       return true;
     return IndexCtx.handleReference(Symbols[0], TL.getNameLoc(), Parent,