[clang] [clang] NFCI: Use `FileEntryRef` for `FileID` creation (PR #67838)

[Ben Langmuir via cfe-commits]

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@@ -527,17 +527,6 @@ FileID SourceManager::getNextFileID(FileID FID) const {
 
 /// Create a new FileID that represents the specified file
 /// being \#included from the specified IncludePosition.
-///
-/// This translates NULL into standard input.
-FileID SourceManager::createFileID(const FileEntry *SourceFile,
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benlangmuir wrote:

Were there no callers that could pass `NULL`?

https://github.com/llvm/llvm-project/pull/67838