swift

71eaa5d7 - [GSB] Add visualization of same-type constraints in an equivalence class.

[GSB] Add visualization of same-type constraints in an equivalence class. Introduce support for writing a GraphViz graph describing the same-type constraints within an equivalence class. This visualization helps debugging the minimization algorithm. LLVM's GraphWriter is actually kinda awful, so there is some hackery here both to dodge an overzealous static assertion and to munge the output into an undirected graph. NFC except for debugging.