Missing coreir primitives

[leonardt]

These primitives need DefineOp, Op and op versions

• [x] mux
• [x] negate
• [ ] min, max
• [ ] abs
• [ ] memory

Pseudoprimitives (meta-programmed in python)

• [x] concat
• [x] repeat
• [ ] rol, ror

[leonardt]

@phanrahan can you remind me what rol and ror are?

@rdaly525 planning to include min, max, and abs as primitives? Or should I define them in terms of the existing primitives

[phanrahan]

rol is rotate left, ror is rotate right.