[clang] [include-cleaner] Support multi-header symbols in mapping generator (PR #147720)

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=?utf-8?q?Ildikó?= Cseri <cseriildiko at icloud.com>,
=?utf-8?q?Ildikó?= Cseri <cseriildiko at icloud.com>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/147720 at github.com>


https://github.com/itislu edited https://github.com/llvm/llvm-project/pull/147720