Partially stabilize LoongArch target features

Author: heiher

compiler/rustc_target/src/target_features.rs

@@ -765,11 +765,11 @@ const LOONGARCH_FEATURES: &[(&str, StabilityUncomputed, ImpliedFeatures)] = &[
     // tidy-alphabetical-start
     ("d", unstable(sym::loongarch_target_feature), &["f"]),
     ("f", unstable(sym::loongarch_target_feature), &[]),
-    ("frecipe", unstable(sym::loongarch_target_feature), &[]),
-    ("lasx", unstable(sym::loongarch_target_feature), &["lsx"]),
-    ("lbt", unstable(sym::loongarch_target_feature), &[]),
-    ("lsx", unstable(sym::loongarch_target_feature), &["d"]),
-    ("lvz", unstable(sym::loongarch_target_feature), &[]),
+    ("frecipe", STABLE, &[]),
+    ("lasx", STABLE, &["lsx"]),
+    ("lbt", STABLE, &[]),
+    ("lsx", STABLE, &["d"]),
+    ("lvz", STABLE, &[]),
     ("relax", unstable(sym::loongarch_target_feature), &[]),
     ("ual", unstable(sym::loongarch_target_feature), &[]),
     // tidy-alphabetical-end