Auto merge of #135015 - heiher:stabilize-loongarch-target-features, r=Amanieu

Partially stabilize LoongArch target features

Stabilization PR for the LoongArch target features. This PR stabilizes some of the target features tracked by #44839.

Specifically, this PR stabilizes the following target features:

* f
* d
* frecipe
* lasx
* lbt
* lsx
* lvz

Docs PR: https://github.com/rust-lang/reference/pull/1707

r? `@Amanieu`

compiler/rustc_target/src/target_features.rs

@@ -693,17 +693,17 @@ static CSKY_FEATURES: &[(&str, Stability, ImpliedFeatures)] = &[
 
 static LOONGARCH_FEATURES: &[(&str, Stability, ImpliedFeatures)] = &[
     // tidy-alphabetical-start
-    ("d", Unstable(sym::loongarch_target_feature), &["f"]),
+    ("d", Stable, &["f"]),
     ("div32", Unstable(sym::loongarch_target_feature), &[]),
-    ("f", Unstable(sym::loongarch_target_feature), &[]),
-    ("frecipe", Unstable(sym::loongarch_target_feature), &[]),
+    ("f", Stable, &[]),
+    ("frecipe", Stable, &[]),
     ("lam-bh", Unstable(sym::loongarch_target_feature), &[]),
     ("lamcas", Unstable(sym::loongarch_target_feature), &[]),
-    ("lasx", Unstable(sym::loongarch_target_feature), &["lsx"]),
-    ("lbt", Unstable(sym::loongarch_target_feature), &[]),
+    ("lasx", Stable, &["lsx"]),
+    ("lbt", Stable, &[]),
     ("ld-seq-sa", Unstable(sym::loongarch_target_feature), &[]),
-    ("lsx", Unstable(sym::loongarch_target_feature), &["d"]),
-    ("lvz", Unstable(sym::loongarch_target_feature), &[]),
+    ("lsx", Stable, &["d"]),
+    ("lvz", Stable, &[]),
     ("relax", Unstable(sym::loongarch_target_feature), &[]),
     ("scq", Unstable(sym::loongarch_target_feature), &[]),
     ("ual", Unstable(sym::loongarch_target_feature), &[]),

tests/ui/target-feature/abi-required-target-feature-flag-disable.loongarch.stderr

@@ -3,9 +3,5 @@ warning: target feature `d` must be enabled to ensure that the ABI of the curren
    = note: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #116344 <https://github.com/rust-lang/rust/issues/116344>
 
-warning: unstable feature specified for `-Ctarget-feature`: `d`
-   |
-   = note: this feature is not stably supported; its behavior can change in the future
-
-warning: 2 warnings emitted
+warning: 1 warning emitted
 

tests/ui/target-feature/abi-required-target-feature-flag-disable.rs

@@ -24,4 +24,4 @@
 pub trait Sized {}
 
 //~? WARN must be enabled to ensure that the ABI of the current target can be implemented correctly
-//[x86,riscv,loongarch]~? WARN unstable feature specified for `-Ctarget-feature`
+//[x86,riscv]~? WARN unstable feature specified for `-Ctarget-feature`