20% compiler memory usage regression in syntex_syntax incremental compile

[alexcrichton]

According to perf.rust-lang.org the syntex_syntax benchmark for a clean incremental compile regressed 20% in compiler memory usage due to #43028.

@michaelwoerister is it helpful to track "regressions" for incremental compilation right now? Or is enough in flux that we should not worry about it just yet?

[michaelwoerister]

I'd say, not quite yet as there are some big changes around the corner. Also, I'm not sure how reliable perf.rlo is for anything after #43506. (@Mark-Simulacrum would know more about the current state there).

[alexcrichton]

Ok sounds like we shouldn't track incremental-related regressions yet, so I'll close.