Triage document for this week

A very quiet week.

Author: Mark-Simulacrum

triage/2020-08-11.md

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+# 2020-08-11 Triage Log
+
+See the [README](README.md) for details on how this log was gathered.
+
+Triage done by [simulacrum](https://github.com/Mark-Simulacrum).
+Revision range: [19cefa68640843956eedd86227ddc1d35dbc6754..8b84156c6ee2b4e707dc32f5a516e3143ab924d3](https://perf.rust-lang.org/?start=19cefa68640843956eedd86227ddc1d35dbc6754&end=8b84156c6ee2b4e707dc32f5a516e3143ab924d3&absolute=false&stat=instructions%3Au)
+
+1 regression, 1 improvement, 1 of them on rollups.
+0 outstanding nags from last week.
+
+Regressions
+* [Rollup of 5 pull requests #75174](https://github.com/rust-lang/rust/pull/75174)
+  ([instructions](https://perf.rust-lang.org/compare.html?start=32d14eba47ee8bb0b5edb04bcf652517f81c4cf5&end=119d2a1a98fe87d4ae6cabf12134a0ef2fb95851))
+  Slight loss, up to 1%. Unclear if spurious. Likely caused by [Replace `Memoryblock` with `NonNull<[u8]>` #75152](https://github.com/rust-lang/rust/pull/75152).
+
+Improvements
+* [Remove two fields from `SubstFolder` #75133](https://github.com/rust-lang/rust/pull/75133)
+  ([instructions](https://perf.rust-lang.org/compare.html?start=c9b80bb3ff194d488fdd95da2ef23bd466f921cb&end=d08eb98698cbce56e599324fb83d55eef2cac408))
+  Up to 2% wins on wf-projection stress test.
+
+New nags to follow up on
+* [#75174](https://github.com/rust-lang/rust/pull/75152#issuecomment-672452770)
+
+Recollecting these, likely their results are caused by perf.rlo collector
+updates:
+* `5f6bd6ec0ac422991b89bb8643eaa5d9d46eed11` - https://perf.rust-lang.org/compare.html?start=c9b80bb3ff194d488fdd95da2ef23bd466f921cb&end=5f6bd6ec0ac422991b89bb8643eaa5d9d46eed11