[clang-tools-extra] [clangd] Resolve the dependent type from its single instantiation. Take 1 (PR #71279)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff cd6022916bff1d6fab007b554810b631549ba43c d73a8e2ee683e6812c21cb1de7363b14565a96d1 -- clang-tools-extra/clangd/HeuristicResolver.cpp clang-tools-extra/clangd/unittests/XRefsTests.cpp
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<details>
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View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/clangd/HeuristicResolver.cpp b/clang-tools-extra/clangd/HeuristicResolver.cpp
index d3dced9b3253..96b9afa7d8ea 100644
--- a/clang-tools-extra/clangd/HeuristicResolver.cpp
+++ b/clang-tools-extra/clangd/HeuristicResolver.cpp
@@ -56,7 +56,8 @@ const Type *resolveDeclsToType(const std::vector<const NamedDecl *> &Decls,
 // dependent one. Its associated type will then be extracted.
 struct InstantiatedDeclVisitor : RecursiveASTVisitor<InstantiatedDeclVisitor> {
 
-  InstantiatedDeclVisitor(NamedDecl *DependentDecl) : DependentDecl(DependentDecl) {}
+  InstantiatedDeclVisitor(NamedDecl *DependentDecl)
+      : DependentDecl(DependentDecl) {}
 
   bool shouldVisitTemplateInstantiations() const { return true; }
 
@@ -64,8 +65,7 @@ struct InstantiatedDeclVisitor : RecursiveASTVisitor<InstantiatedDeclVisitor> {
 
   bool shouldVisitImplicitCode() const { return true; }
 
-  template <typename D>
-  bool onDeclVisited(D *MaybeInstantiated) {
+  template <typename D> bool onDeclVisited(D *MaybeInstantiated) {
     if (MaybeInstantiated->getDeclContext()->isDependentContext())
       return true;
     auto *Dependent = dyn_cast<D>(DependentDecl);
@@ -82,13 +82,9 @@ struct InstantiatedDeclVisitor : RecursiveASTVisitor<InstantiatedDeclVisitor> {
     return false;
   }
 
-  bool VisitFieldDecl(FieldDecl *FD) {
-    return onDeclVisited(FD);
-  }
+  bool VisitFieldDecl(FieldDecl *FD) { return onDeclVisited(FD); }
 
-  bool VisitVarDecl(VarDecl *VD) {
-    return onDeclVisited(VD);
-  }
+  bool VisitVarDecl(VarDecl *VD) { return onDeclVisited(VD); }
 
   NamedDecl *DependentDecl;
   QualType DeducedType;

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https://github.com/llvm/llvm-project/pull/71279