[clang] [clang][Lex] Add null check for `IncludeTok` in `PreprocessingRecord::InclusionDirective` (PR #192051)

[via cfe-commits]

https://github.com/StepfenShawn created https://github.com/llvm/llvm-project/pull/192051

Add a defensive null check for `getIdentifierInfo()` in `PreprocessingRecord::InclusionDirective` to prevent potential null pointer dereference.
The function assumes the token has valid identifier info, but `getIdentifierInfo()` can return nullptr for literals or EOF tokens.

>From 080b4059b99669509ee1fb122ab43bfcb75af98c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=F0=9F=8D=8CShawn?= <m18824909883 at 163.com>
Date: Tue, 14 Apr 2026 20:53:06 +0800
Subject: [PATCH] Add null check for IncludeTok in PreprocessingRecord.cpp

---
 clang/lib/Lex/PreprocessingRecord.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Lex/PreprocessingRecord.cpp b/clang/lib/Lex/PreprocessingRecord.cpp
index f76155b1c45d6..d0f09552a003b 100644
--- a/clang/lib/Lex/PreprocessingRecord.cpp
+++ b/clang/lib/Lex/PreprocessingRecord.cpp
@@ -473,7 +473,11 @@ void PreprocessingRecord::InclusionDirective(
     bool ModuleImported, SrcMgr::CharacteristicKind FileType) {
   InclusionDirective::InclusionKind Kind = InclusionDirective::Include;
 
-  switch (IncludeTok.getIdentifierInfo()->getPPKeywordID()) {
+  IdentifierInfo *II = IncludeTok.getIdentifierInfo();
+  if (!II)
+    llvm_unreachable("Invalid include directive token");
+
+  switch (II->getPPKeywordID()) {
   case tok::pp_include:
     Kind = InclusionDirective::Include;
     break;