[llvm] [llvm] Use llvm::append_range (NFC) (PR #136066)

[Nikita Popov via llvm-commits]

nikic wrote:

This caused a compile-time regression: https://llvm-compile-time-tracker.com/compare.php?from=799916ae1047cac6f6af8aed1499d8bf1b921f82&to=47d8fec9b8bd5425af17711317a41743a30a8cef&stat=instructions:u

https://github.com/llvm/llvm-project/pull/136066