Add triage for 2021-04-28

triage/2021-04-28.md

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+# 2021-04-28 Triage Log
+
+It's always nice to have a week without any regressions and 2 small improvements 🎉🎉.
+
+Triage done by **@rylev**.
+Revision range: [6df26f897cffb2d86880544bb451c6b5f8509b2d..537544b1061467ee4b74ef7f552fab3d513e5caf](https://perf.rust-lang.org/?start=6df26f897cffb2d86880544bb451c6b5f8509b2d&end=537544b1061467ee4b74ef7f552fab3d513e5caf&absolute=false&stat=instructions%3Au)
+
+0 Regressions, 2 Improvements, 0 Mixed
+0 of them in rollups
+
+#### Regressions
+
+#### Improvements
+
+Use arrayvec 0.7, drop smallvec 0.6 [#84420](https://github.com/rust-lang/rust/issues/84420)
+- Moderate improvement in [instruction counts](https://perf.rust-lang.org/compare.html?start=5f1aeb52c22e3784928765e34be6dc0d17a350b4&end=7f4afdf0255600306bf67432da722c7b5d2cbf82&stat=instructions:u) (up to -2.8% on `full` builds of `externs-debug`)
+
+Update grab bag [#84498](https://github.com/rust-lang/rust/issues/84498)
+- Moderate improvement in [instruction counts](https://perf.rust-lang.org/compare.html?start=27bd3f51a90733aabee45a9019a3aa785eccfd05&end=537544b1061467ee4b74ef7f552fab3d513e5caf&stat=instructions:u) (up to -1.1% on `full` builds of `match-stress-enum-check`)
+
+#### Mixed
+
+#### Nags requiring follow up
+
+* There has still been no follow up to [last week's issue](https://github.com/rust-lang/rust/pull/84130#issuecomment-823898920).