Add a regression test for issue-89875

Author: JohnTitor

src/test/ui/asm/x86_64/issue-89875.rs

@@ -0,0 +1,14 @@
+// build-pass
+// only-x86_64
+
+#![feature(asm, target_feature_11)]
+
+#[target_feature(enable = "avx")]
+fn main() {
+    unsafe {
+        asm!(
+            "/* {} */",
+            out(ymm_reg) _,
+        );
+    }
+}