[clang] Fix -Wreorder-ctor of DependentFunctionTemplateSpecializationInfo (NFC)

/llvm-project/clang/lib/AST/Decl.cpp:4182:7: error: field 'TemplateArgumentsAsWritten' will be initialized after field 'NumCandidates' [-Werror,-Wreorder-ctor]
    : TemplateArgumentsAsWritten(TemplateArgsWritten),
      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      NumCandidates(Candidates.size())
1 error generated.

Author: DamonFool

clang/lib/AST/Decl.cpp

@@ -4179,8 +4179,8 @@ DependentFunctionTemplateSpecializationInfo::
     DependentFunctionTemplateSpecializationInfo(
         const UnresolvedSetImpl &Candidates,
         const ASTTemplateArgumentListInfo *TemplateArgsWritten)
-    : TemplateArgumentsAsWritten(TemplateArgsWritten),
-      NumCandidates(Candidates.size()) {
+    : NumCandidates(Candidates.size()),
+      TemplateArgumentsAsWritten(TemplateArgsWritten) {
   std::transform(Candidates.begin(), Candidates.end(),
                  getTrailingObjects<FunctionTemplateDecl *>(),
                  [](NamedDecl *ND) {