release/20.x: Backport [LLD][COFF] Disallow importing DllMain from import libraries (#146610)#146699

aganea wants to merge 2 commits intollvm:release/20.xllvm/llvm-project:release/20.xfrom

aganea:fix/backport_lld_exported_dllmainaganea/llvm-project:fix/backport_lld_exported_dllmainCopy head branch name to clipboard