[llvm-branch-commits] [ELF] Support placing .lbss/.lrodata/.ldata after .bss (PR #81224)

[Fangrui Song via llvm-branch-commits]

MaskRay wrote:

```
Merged
merged 5 commits into [users/MaskRay/spr/main.elf-place-lbsslrodataldata-after-bss](https://github.com/llvm/llvm-project/tree/users/MaskRay/spr/main.elf-place-lbsslrodataldata-after-bss) from [users/MaskRay/spr/elf-place-lbsslrodataldata-after-bss](https://github.com/llvm/llvm-project/tree/users/MaskRay/spr/elf-place-lbsslrodataldata-after-bss)
```

Since the base branch is not main, it seems that "merge" in the web UI merges this to the `/users/MaskRay/spr/...` branch instead of `main`. I guess I need to push this squashed commit to `main` manually.

https://github.com/llvm/llvm-project/pull/81224