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

[Nikita Popov via llvm-commits]

nikic wrote:

I reverted just the problematic line in https://github.com/llvm/llvm-project/commit/f696508b38d1958aac5992a98a90fe6e773e8709, after confirming that it was indeed the cause of the regression.

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