[all-commits] [llvm/llvm-project] 4a9b5a: [libc][NFC] remove TODO about AppProperties (#79356)

[Schrodinger ZHU Yifan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4a9b5aa1164c1eff68c98c1513cab3ac0c52b4af
      https://github.com/llvm/llvm-project/commit/4a9b5aa1164c1eff68c98c1513cab3ac0c52b4af
  Author: Schrodinger ZHU Yifan <yifanzhu at rochester.edu>
  Date:   2024-01-24 (Wed, 24 Jan 2024)

  Changed paths:
    M libc/startup/linux/do_start.cpp

  Log Message:
  -----------
  [libc][NFC] remove TODO about AppProperties (#79356)

```
AppProperties app;
```
is marked as a weak symbol in header now. One can just use `&app !=
nullptr` to check if `app` is defined. There is no need to define it for
overlay mode.