clang-embed is failing to build

[mattgodbolt]

2021-11-01T15:27:20.8683239Z In file included from /root/llvm-project/clang/include/clang/Lex/PreprocessingRecord.h:20:0,
2021-11-01T15:27:20.8685411Z                  from /root/llvm-project/clang/include/clang/Frontend/ASTUnit.h:27,
2021-11-01T15:27:20.8716795Z                  from /root/llvm-project/clang/include/clang/Frontend/FrontendAction.h:23,
2021-11-01T15:27:20.8718834Z                  from /root/llvm-project/clang/include/clang/ARCMigrate/ARCMTActions.h:13,
2021-11-01T15:27:20.8721150Z                  from /root/llvm-project/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:14:
2021-11-01T15:27:20.8725461Z /root/llvm-project/clang/include/clang/Lex/PPCallbacks.h:603:8: error: 'void clang::PPChainedCallbacks::HasEmbed(clang::SourceLocation, llvm::StringRef, bool, llvm::Optional<clang::FileEntryRef>)' marked 'override', but does not override
2021-11-01T15:27:20.8953022Z    void HasEmbed(SourceLocation Loc, StringRef FileName, bool IsAngled,
2021-11-01T15:27:20.8954273Z         ^~~~~~~~
2021-11-01T15:27:20.8958557Z /root/llvm-project/clang/include/clang/Lex/PPCallbacks.h:379:16: warning: 'virtual void clang::PPCallbacks::HasEmbed(clang::SourceLocation, llvm::StringRef, bool, llvm::Optional<clang::FileEntryRef>, clang::SrcMgr::CharacteristicKind)' was hidden [-Woverloaded-virtual]

[mattgodbolt]

Built with mostly defaults: see

clang-builder/build/build.sh

Lines 39 to 43 in 8e23d61

	embed-trunk)
	BRANCH=feature/embed
	URL=https://github.com/ThePhD/llvm-project.git
	VERSION=embed-trunk-$(date +%Y%m%d)
	;;