[clang][RecordLayoutBuilder] Be stricter about inferring packed-ness in ExternalLayouts#97443

Michael137 wants to merge 4 commits intollvm:mainllvm/llvm-project:mainfrom

Michael137:clang/lldb/inferalignment-removalMichael137/llvm-project:clang/lldb/inferalignment-removalCopy head branch name to clipboard