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

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github-actions[bot] wrote:

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# :window: Windows x64 Test Results

* 53646 tests passed
* 1101 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### Clang
<details>
<summary>Clang.Lexer/pp-inclusion-directive.c</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
c:\_work\llvm-project\llvm-project\build\bin\clang.exe -cc1 -internal-isystem C:\_work\llvm-project\llvm-project\build\lib\clang\23\include -nostdsysteminc -fsyntax-only -detailed-preprocessing-record C:\_work\llvm-project\llvm-project\clang\test\Lexer\pp-inclusion-directive.c
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\clang.exe' -cc1 -internal-isystem 'C:\_work\llvm-project\llvm-project\build\lib\clang\23\include' -nostdsysteminc -fsyntax-only -detailed-preprocessing-record 'C:\_work\llvm-project\llvm-project\clang\test\Lexer\pp-inclusion-directive.c'
# .---command stderr------------
# | C:\_work\llvm-project\llvm-project\clang\test\Lexer\pp-inclusion-directive.c:6:10: error: 'pp-inclusion-directive.h' file not found with <angled> include; use "quotes" instead
# |     6 | #include <pp-inclusion-directive.h>
# |       |          ^~~~~~~~~~~~~~~~~~~~~~~~~~
# |       |          "pp-inclusion-directive.h"
# | C:\_work\llvm-project\llvm-project\clang\test\Lexer\pp-inclusion-directive.c:7:1: error: expected identifier or '('
# |     7 | @import pp-inclusion-directive;
# |       | ^
# | C:\_work\llvm-project\llvm-project\clang\test\Lexer\pp-inclusion-directive.c:8:2: warning: #include_next in primary source file; will search from start of include path [-Winclude-next-outside-header]
# |     8 | #include_next pp-inclusion-directive.h
# |       |  ^
# | C:\_work\llvm-project\llvm-project\clang\test\Lexer\pp-inclusion-directive.c:8:15: error: expected "FILENAME" or <FILENAME>
# |     8 | #include_next pp-inclusion-directive.h
# |       |               ^
# | 1 warning and 3 errors generated.
# `-----------------------------
# error: command failed with exit status: 1

--

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

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