Add perf triage for this week

Author: Mark-Simulacrum

draft/2024-09-18-this-week-in-rust.md

@@ -102,7 +102,16 @@ If you are an event organizer hoping to expand the reach of your event, please s
 
 ### Rust Compiler Performance Triage
 
-<!-- Perf results go here -->
+A relatively quiet week, with overall neutral performance across our set of key
+metrics (instructions, cycles, memory).
+
+Triage done by **@simulacrum**.
+Revision range: [263a3aee..170d6cb8](https://perf.rust-lang.org/?start=263a3aeeb8f2d0e9cc85eee61774d1f5f23dc3f5&end=170d6cb845c8c3f0dcec5cdd4210df9ecf990244&absolute=false&stat=instructions%3Au)
+
+2 Regressions, 3 Improvements, 4 Mixed; 2 of them in rollups
+54 artifact comparisons made in total
+
+[Full report here](https://github.com/rust-lang/rustc-perf/blob/master/triage/2024-09-16.md)
 
 ### [Approved RFCs](https://github.com/rust-lang/rfcs/commits/master)