[clang-check][syntax] buildIdentifier Assertion `NameSpecifierTokens.size() == 1'` failed.

This input is generated by a fuzzer.
```cxx
namespace Templates {
template
void f() {
struct Inner {
static int getValue() { return Value; }
};
}
}
int main()
{
f();
}
```
```
clang-check --tokens-dump example.cpp -- -xc++ -std=c++23
```

stacktrace:
```
clang-check: /home/ubuntu2404/llvm-project-196067/clang/lib/Tooling/Syntax/BuildTree.cpp:934: clang::syntax::NameSpecifier* {anonymous}::BuildTreeVisitor::buildIdentifier(clang::SourceRange, bool): Assertion `NameSpecifierTokens.size() == 1' failed.
#0 0x0000644148dfd1f1 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x96d1f1)
#1 0x0000644148df9dac llvm::sys::RunSignalHandlers() (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x969dac)
#2 0x0000644148df9f0c SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#3 0x0000748e84845330 (/lib/x86_64-linux-gnu/libc.so.6+0x45330)
#4 0x0000748e8489eb2c __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
#5 0x0000748e8489eb2c __pthread_kill_internal ./nptl/pthread_kill.c:78:10
#6 0x0000748e8489eb2c pthread_kill ./nptl/pthread_kill.c:89:10
#7 0x0000748e8484527e raise ./signal/../sysdeps/posix/raise.c:27:6
#8 0x0000748e848288ff abort ./stdlib/abort.c:81:7
#9 0x0000748e8482881b _nl_load_domain ./intl/loadmsgcat.c:1177:9
#10 0x0000748e8483b517 (/lib/x86_64-linux-gnu/libc.so.6+0x3b517)
#11 0x00006441491950c2 (anonymous namespace)::BuildTreeVisitor::buildIdentifier(clang::SourceRange, bool) BuildTree.cpp:0:0
#12 0x00006441491ac893 (anonymous namespace)::BuildTreeVisitor::TraverseNestedNameSpecifierLoc(clang::NestedNameSpecifierLoc) BuildTree.cpp:0:0
#13 0x00006441491af1e4 clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseUnresolvedMemberExpr(clang::UnresolvedMemberExpr*, llvm::SmallVectorImpl, llvm::PointerIntPairInfo>>>*) BuildTree.cpp:0:0
#14 0x00006441491a49be clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseStmt(clang::Stmt*, llvm::SmallVectorImpl, llvm::PointerIntPairInfo>>>*) (.constprop.0) BuildTree.cpp:0:0
#15 0x00006441491a9a2d clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseObjCBoxedExpr(clang::ObjCBoxedExpr*, llvm::SmallVectorImpl, llvm::PointerIntPairInfo>>>*) BuildTree.cpp:0:0
#16 0x00006441491a49be clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseStmt(clang::Stmt*, llvm::SmallVectorImpl, llvm::PointerIntPairInfo>>>*) (.constprop.0) BuildTree.cpp:0:0
#17 0x00006441491a6bfc clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseCompoundStmt(clang::CompoundStmt*, llvm::SmallVectorImpl, llvm::PointerIntPairInfo>>>*) BuildTree.cpp:0:0
#18 0x00006441491a49be clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseStmt(clang::Stmt*, llvm::SmallVectorImpl, llvm::PointerIntPairInfo>>>*) (.constprop.0) BuildTree.cpp:0:0
#19 0x00006441491af740 clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseFunctionHelper(clang::FunctionDecl*) BuildTree.cpp:0:0
#20 0x000064414919bddc clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseDecl(clang::Decl*) BuildTree.cpp:0:0
#21 0x000064414919caea clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseDeclContextHelper(clang::DeclContext*) BuildTree.cpp:0:0
#22 0x00006441491b583b clang::RecursiveASTVisitor<(anonymous namespace)::BuildTreeVisitor>::TraverseTranslationUnitDecl(clang::TranslationUnitDecl*) BuildTree.cpp:0:0
#23 0x000064414919c439 clang::syntax::buildSyntaxTree(clang::syntax::Arena&, clang::syntax::TokenBufferTokenManager&, clang::ASTContext&) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xd0c439)
#24 0x00006441488904af (anonymous namespace)::DumpSyntaxTree::CreateASTConsumer(clang::CompilerInstance&, llvm::StringRef)::Consumer::HandleTranslationUnit(clang::ASTContext&) ClangCheck.cpp:0:0
#25 0x000064414a6c6f9c clang::ParseAST(clang::Sema&, bool, bool) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x2236f9c)
#26 0x0000644148e54271 clang::FrontendAction::Execute() (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x9c4271)
#27 0x0000644148ea0308 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xa10308)
#28 0x000064414917ccb7 clang::tooling::FrontendActionFactory::runInvocation(std::shared_ptr, clang::FileManager*, std::shared_ptr, clang::DiagnosticConsumer*) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xceccb7)
#29 0x0000644149176b2a clang::tooling::ToolInvocation::runInvocation(char const*, clang::driver::Compilation*, std::shared_ptr, std::shared_ptr) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xce6b2a)
#30 0x00006441491791e2 clang::tooling::ToolInvocation::run() (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xce91e2)
#31 0x000064414917ae19 clang::tooling::ClangTool::run(clang::tooling::ToolAction*) (/home/ubuntu2404/build-196067-assert/bin/clang-check+0xceae19)
#32 0x0000644148815405 main (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x385405)
#33 0x0000748e8482a1ca __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#34 0x0000748e8482a28b call_init ./csu/../csu/libc-start.c:128:20
#35 0x0000748e8482a28b __libc_start_main ./csu/../csu/libc-start.c:347:5
#36 0x000064414888f045 _start (/home/ubuntu2404/build-196067-assert/bin/clang-check+0x3ff045)
Aborted (core dumped)
```

Run the reported clang-check command with the supplied C++ reproducer, then inspect clang/lib/Tooling/Syntax/BuildTree.cpp around buildIdentifier and the buildSyntaxTree path shown in the stack trace. Done means this input no longer triggers the NameSpecifierTokens assertion or aborts clang-check; verify the behavior with the reproducer and relevant syntax tooling tests.

Written by the indexing model from the issue text.