Description
Some users of my tutorial have been experiencing memory issues on my buffer tutorial. It seems to only be an issue on the new M1 chips.

Repro steps
You'll need a mac with and M1 chip, then run the tutorial code here https://github.com/sotrh/learn-wgpu/tree/master/code/beginner/tutorial4-buffer. If you have the repo already downloaded you can just run cargo run --bin tutorial4-buffer.

Expected vs observed behavior
The expected behaviour is no memory leaks on M1

Extra materials
I don't have a Mac, so I can't provide hardware specifics other that it's occurring on M1, but the I'll link the issue from my repo here. sotrh/learn-wgpu#207

Platform
OSX with M1 chip, wgpu 0.9