Apparent 1000% regression in llvm phase of bootstrap

[nrc]

See perf

Given that there has been no shouting, this could be due to something which only affects the perf server. Should still investigate.

cc @rust-lang/compiler

[nagisa]

Given #34891 (comment) #33890 may be the cause,

[nikomatsakis]

triage: P-high

[nagisa]

#34917 (might be a fix) landed 19 hours ago only.

[alexcrichton]

Copying over regression/I-slow tags from #34998, which I"m closing in favor of this.

@nikomatsakis as a P-high bug, do you know if someone would be suitable to assign to this?

[nagisa]

We still haven’t any measurements with nightly containing the PR I linked above. 2016-07-13 seems to be the last measurement done. @nrc is there anyway a manual run could be invoked?

[pmarcelll]

@nagisa I wanted to benchmark my small BF interpreter (it slowed down a bit after the 2016-06-24 nightly) but unfortunately there's no released nightly containing that PR, the bots are failing due to #35002. @alexcrichton is there a way to temporarily increase the timeout length on the bots? It would be a short-term solution and we would have a new nightly (hopefully).

[alexcrichton]

@pmarcelll yeah I'm trying to get a nightly out, not sure what's all been going on :(