Implement Multi-Clock

[VonTum]

The idea is, to use the domain system to have modules request specific clock constraints.

Something like:

module myMod {
  domain A
  input int a_in
  
  domain B async to A
  output int b_out
  CrossAsyncDomain cr
  cr.in = a_in
  b_out = cr.out
  
  domain C sync to A * 3
  output int c_out
  CrossDomain cr_sync
  cr_sync.in = a_in
  c_out = cr_sync.out
}

Roadmap:

• Define Syntax
• AST / Flattening / Instantiation
• Typechecking forbid bad domain connections
• Synchronous Clocks
• Asynchronous Clocks
• Codegen add extra clk_A, clk_B specifiers