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

[Yanzuo Liu via cfe-commits]

================
@@ -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");
----------------
zwuis wrote:

`assert(II && "...")`

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