Codegen for Ares

[eamsden]

Supersedes #89 with much cleaner history and rebased onto status. @matthew-levan work on integrating the codegen into rust-side Ares should happen here.

Edward TODO

• Fix missing cases in linearizer
• cons/decons and move renaming in linearizer
• %phi and %hip elimination in linearizer (minimize register set?)
• move +wink to a separate hoon file or even generator (make sure axes are re-established in rust-side code)
• tag top-level codegen core with an incrementing version constant, and check it on rust side (make sure axes are re-established in rust-side code)
• In-depth review of rust-side execution code
• Thoroughly review linearizer crash and poison logic
• Thread "which interpreter" enum through context
• Thread slow stack through jets and jet helpers
• Add to or delete from hill hamt by diffs emitted from +poke in codegen core
• Make jets and helpers use "which interpreter" enum

[eamsden]

@matthew-levan there are a lot of instances of missing break statements where errors should be returned but won't be. A couple of examples are below but the error is pervasive. Please correct all instances.