bcarlet

While we're considering breaking changes to the standard primitives, I'll also throw #497 in for consideration (as a potential breaking change to `std_slice`, specifically the change described [here](https://github.com/cucapra/calyx/issues/497#issuecomment-847903821)). I find...

From my notes, the issues that we agreed were immediately actionable were: - Adding an `add_primitive()` function to `ir::LibrarySignatures` and giving mutable access in `ir::Builder`. That should be covered by...

Sure, take any file that imports primitives: ``` import "primitives/compile.futil"; // The component doesn't matter component main() -> (out: 8) { cells { r = std_reg(8); } wires { out...