a lot of Ref location outside file message print out when dumping a HTML report

[hokein]

running clang-include-cleaner to dump html report on SemaExpr.cpp, it prints a lot of the error messages because of the def include pattern is used in the main file.

Ref location outside file! clang::BuiltinType at /workspace/llvm-project/clang/include/clang/AST/BuiltinTypes.def:246:1 <Spelling=llvm-project/clang/lib/Sema/SemaExpr.cpp:21073:44>

This is a FIXME in https://github.com/llvm/llvm-project/blob/main/clang-tools-extra/include-cleaner/lib/HTMLReport.cpp#L224. Options:

• remove the llvm::errs statement directly
• use the spelling loc as the ref loc (this implies that a lot of refs are bind to the same location, which doesn't seem useful)

[llvmbot]

@llvm/issue-subscribers-clang-include-cleaner