Use .rsplit_once("/src/") instead of .split_once("/src/").

Author: eddyb

crates/rustc_codegen_spirv/src/linker/spirt_passes/diagnostics.rs

@@ -332,7 +332,7 @@ impl DiagnosticReporter<'_> {
             let prefix = match level {
                 DiagLevel::Bug(location) => {
                     let location = location.to_string();
-                    let location = match location.split_once("/src/") {
+                    let location = match location.rsplit_once("/src/") {
                         Some((_path_prefix, intra_src)) => intra_src,
                         None => &location,
                     };