Clarify PR responsible for underlying improvements

Author: rylev

Diff for: triage/2021-02-24.md

@@ -23,7 +23,7 @@ Only store a LocalDefId in some HIR nodes [#81611](https://github.com/rust-lang/
 
 Inline try_get_cached [#82197](https://github.com/rust-lang/rust/issues/82197)
 - Very large improvement in [instruction counts](https://perf.rust-lang.org/compare.html?start=8fe989dd768f5dfdb0fc90933f3f74fa4579fefd&end=ee88f46bb5e27c4d9f30326e69ff2298dcbeecb1&stat=instructions:u) (up to -10.4% on `full` builds of `externs-debug`)
-- An attempt to fix an issue due to a bad interaction with [#81892](https://github.com/rust-lang/rust/issues/81892) which removed a bunch of largely unnecessary inline directives.
+- This is a small adjustment to an inline hint based of [#81855](https://github.com/rust-lang/rust/pull/81855) where a large portion of the actual change was implemented. #81855 initially showed a large improvement but this was lost after merging due to another change [#81892](https://github.com/rust-lang/rust/issues/81892) which affected inlining. #82197 merely added this back.
 
 Reduce size of InterpErrorInfo to 8 bytes [#82116](https://github.com/rust-lang/rust/issues/82116)
 - Moderate improvement in [instruction counts](https://perf.rust-lang.org/compare.html?start=ee88f46bb5e27c4d9f30326e69ff2298dcbeecb1&end=5ef21063f0c0fd5b973bfa8cb88c0b70982da977&stat=instructions:u) (up to -4.1% on `full` builds of `ctfe-stress-4-check`)