This is a collection of random changes coming from the workload I'm working on. The most important change is better support for `.params`: PTX uses .param namespace both for some local variables and kernel args. This is a problem for us because those are different address spaces on AMDGPU. So far we've made an effort to convert to local and const namespaces whenever possible, but this commit tries to handle more patterns, which are impossible to track precisely, by converting to generic space.
* Check Rust formatting on pull requests
This should help us maintain consistent style, without having unrelated style changes in pull requests from running `rustfmt`.
* cargo fmt non-generated files
* Ignore generated files
