Add triage

Author: Mark-Simulacrum

triage/2020-09-15.md

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+# 2020-09-08 Triage Log
+
+See the [README](README.md) for details on how this log was gathered.
+
+Triage done by @Mark-Simulacrum.
+Revision range: [35fc8359868e65a0970094f648ba87fce634e8c7..a53f449516f23486d2dfd4e5685d4e869e8591d9]()
+
+0 Regressions, 2 Improvements, 0 of them in rollups.
+
+#### Regressions
+
+No regressions noted.
+
+#### Improvements
+
+[BTreeMap mutable iterators should not take any reference to visited nodes during iteration #73971](https://github.com/rust-lang/rust/pull/73971)
+- A ~1.4% improvement on token-stream-stress check in [instruction counts](https://perf.rust-lang.org/compare.html?start=b4bdc07ff5a70175dbcdff7331c557245ddb012f&end=d92155bf6ae0b7d79fc83cbeeb0cc0c765353471)
+
+[make `ConstEvaluatable` more strict #74595](https://github.com/rust-lang/rust/pull/74595)
+- Improvement of up to 2% in [instruction counts](https://perf.rust-lang.org/compare.html?start=d92155bf6ae0b7d79fc83cbeeb0cc0c765353471&end=e2be5f568d1f60365b825530f5b5cb722460591b)
+
+#### Nags requiring follow up
+
+None