[llvm] [CodeGen] Fix lpad padding at section start after empty block (PR #112595)

[Fabian Parzefall via llvm-commits]

pzfl wrote:

Hi @dhoekwater, sorry for the delay. I updated the patch to only keep track of the section again. If this looks good to you, could you please merge this (I do not have write permission)?

https://github.com/llvm/llvm-project/pull/112595