Remove codegen/issue-83623-SIMD-PartialEq.rs
Remove codegen/issue-83623-SIMD-PartialEq.rs

This has regressed due to https://bugs.llvm.org/show_bug.cgi?id=51211.
It's pretty likely that we'll have to eat this regression for this
release.

graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust