[clang] [clang] Implement P2582R1: CTAD from inherited constructors (PR #98788)

[Matheus Izvekov via cfe-commits]

================
@@ -2211,17 +2211,20 @@ CXXDeductionGuideDecl *CXXDeductionGuideDecl::Create(
     ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
     ExplicitSpecifier ES, const DeclarationNameInfo &NameInfo, QualType T,
     TypeSourceInfo *TInfo, SourceLocation EndLocation, CXXConstructorDecl *Ctor,
-    DeductionCandidate Kind) {
-  return new (C, DC) CXXDeductionGuideDecl(C, DC, StartLoc, ES, NameInfo, T,
-                                           TInfo, EndLocation, Ctor, Kind);
+    DeductionCandidate Kind, CXXDeductionGuideDecl *GeneratedFrom,
+    SourceKind SK) {
+  return new (C, DC)
+      CXXDeductionGuideDecl(C, DC, StartLoc, ES, NameInfo, T, TInfo,
+                            EndLocation, Ctor, Kind, GeneratedFrom, SK);
 }
 
 CXXDeductionGuideDecl *
 CXXDeductionGuideDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
   return new (C, ID) CXXDeductionGuideDecl(
       C, nullptr, SourceLocation(), ExplicitSpecifier(), DeclarationNameInfo(),
       QualType(), nullptr, SourceLocation(), nullptr,
-      DeductionCandidate::Normal);
+      DeductionCandidate::Normal, /*GeneratedFrom=*/nullptr,
+      /*SK=*/SourceKind::Alias);
----------------
mizvekov wrote:

Nit: The comment is not really necessary since the spelling of the argument gives enough context.
```suggestion
      SourceKind::Alias);
```

https://github.com/llvm/llvm-project/pull/98788