Summary:
* Looking at `fbcode/PLATFORM.bzl` and per-directory `PACKAGE` files, from the `rust-toolchain.toml` files touched in D47672894, migrate ones that can be migrated to `rust/llvm-fb-15`
* Fix 1 `platform009` strangler (lol) and remove 1 that does not have a `Cargo.toml` file since D46411801
Reviewed By: zertosh
Differential Revision: D47930524
fbshipit-source-id: 52f0a8ba5c42dc2d8541ad57a2c043bdcbf19a30
Summary:
Upgrades to platform010.
1. This will let us use the new `core::arch::asm` macro and get rid of `llvm_asm`.
2. All of fbcode should be upgrading to platform010. See [this post](https://fb.workplace.com/groups/fbcode.fyi/permalink/4768582506510846/) for more information.
Reviewed By: johnhurt
Differential Revision: D34939437
fbshipit-source-id: 2f8a6249c09c74d4e07dbca41994b17a708bf333