Low Level Tools/2018/09/24

Status updates for the week of 2018/09/24

rustc landings:

Merge `bitvec.rs` and `indexed_set.rs`. A big clean-up, and prerequisite for...
Use `HybridBitSet` in `SparseBitMatrix`. Reduced NLL peak memory by 14--45% on four rustc-perf benchmarks, and 96% on one external crate!
Split `Liveness::users` into three. Reduces non-NLL peak memory by 20% on keccak.
Compress `Liveness` data some more. Reduces instruction counts on NLL benchmarks by up to 16%, and max-rss by up to 38%.
Improve handling of type bounds in `bit_set.rs`. A code clean-up.

I triaged September 15th's nightlies and filed bug 1491761 - Crash in js::CloneRegExpObject
I reviewed bug 1388134 which lazifies reading application directories in the crash manager
I've finished and landed the patch for bug 1463048 which strips out asynchronous minidump generation as it proved unstable and hard to fix
I closed four bugs that had become invalid or were fixed by the removal of the disk space wather: bug 1328321, bug 1206074, bug 876850 and bug 863596
I've landed bug 1490240 which removes all the remaining warnings from the crash reporter code (and some from mozglue too) when building under Windows with clang-cl, unfortunately the patch was backed out for breaking some mozglue code
I've filed and fixed bug 1492815 which ensures that Fennec and GeckoView do not send the 'StackTraces' field when submitting a crash report. This field is large and redundant as it's being used only for generating crash pings
I've investigated some intermittent failures in bug 1376773 which tests crash detection in marionette but couldn't fix the issue yet
I landed a fix for bug 1470223 which will improve the quality of the stack-traces printed out in the logs for try runs
I've prepared a fix for bug 1493365 which was a gtest failure triggered by bug 1470223. It was a hard one to figure out because it was indirectly caused by the increase in memory consumption caused by the latter