test(codegen): Add regression test for issue #152340

Author: TKanX

tests/ui/target-feature/const-target-feature-fn-ptr-coercion.rs

@@ -0,0 +1,33 @@
+//@ only-x86_64
+//@ check-pass
+//
+// Regression test for <https://github.com/rust-lang/rust/issues/152340>.
+
+#![allow(dead_code)]
+
+#[target_feature(enable = "sse2")]
+const fn foo() {}
+
+// DefKind::Const
+const _: () = unsafe {
+    let _: unsafe fn() = foo;
+};
+
+// DefKind::AssocConst
+struct S;
+impl S {
+    const C: () = unsafe {
+        let _: unsafe fn() = foo;
+    };
+}
+
+// DefKind::InlineConst
+fn bar() {
+    let _ = const {
+        unsafe {
+            let _: unsafe fn() = foo;
+        }
+    };
+}
+
+fn main() {}