[LLVM][Utils] Do not error with dirty dir for untracked files (#176246) If someone has untracked files in their tree and they attempt to use the script, it will error out after processing the first commit complaining about a dirty working tree. This patch fixes that by making _check_work_tree look at the git status --porcelain output to ensure it finds entries are not prefixed with a ?, which corresponds to an untracked file. Fixes #174592
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