[clang] [Clang][CodeGen] Emit dereferenceable and nofree for indirect arguments (PR #213347)

[Sayan Sivakumaran via cfe-commits]

sivakusayan wrote:

In case it makes review easier, here is the command to get files I updated manually:
```
git diff main..fix/emit-dereferenceable-and-nofree-for-indirect-args --name-only | xargs grep -L "have been autogenerated by"
```
In particular, `builtin-alias.c` and `builtin.c` take up the majority of the diff but are auto-generated.

https://github.com/llvm/llvm-project/pull/213347