Use the new name for split-debuginfo

Author: jyn514

src/bootstrap/builder.rs

@@ -1160,18 +1160,10 @@ impl<'a> Builder<'a> {
         // itself, we skip it by default since we know it's safe to do so in that case.
         // See https://github.com/rust-lang/rust/issues/79361 for more info on this flag.
         if target.contains("apple") {
-            if stage == 0 {
-                if self.config.rust_run_dsymutil {
-                    rustflags.arg("-Zrun-dsymutil=yes");
-                } else {
-                    rustflags.arg("-Zrun-dsymutil=no");
-                }
+            if self.config.rust_run_dsymutil {
+                rustflags.arg("-Csplit-debuginfo=packed");
             } else {
-                if self.config.rust_run_dsymutil {
-                    rustflags.arg("-Csplit-debuginfo=packed");
-                } else {
-                    rustflags.arg("-Csplit-debuginfo=unpacked");
-                }
+                rustflags.arg("-Csplit-debuginfo=unpacked");
             }
         }