Add feature-gate for f16c target feature

src/libsyntax/feature_gate.rs

@@ -403,6 +403,7 @@ declare_features! (
     (active, cmpxchg16b_target_feature, "1.32.0", Some(44839), None),
     (active, movbe_target_feature, "1.34.0", Some(44839), None),
     (active, rtm_target_feature, "1.35.0", Some(44839), None),
+    (active, f16c_target_feature, "1.36.0", Some(44839), None),
 
     // Allows macro invocations on modules expressions and statements and
     // procedural macros to expand to non-items.

src/test/ui/target-feature-gate.rs

@@ -24,6 +24,7 @@
 // gate-test-cmpxchg16b_target_feature
 // gate-test-movbe_target_feature
 // gate-test-rtm_target_feature
+// gate-test-f16c_target_feature
 // min-llvm-version 6.0
 
 #[target_feature(enable = "avx512bw")]

src/test/ui/target-feature-gate.stderr

@@ -1,5 +1,5 @@
 error[E0658]: the target feature `avx512bw` is currently unstable
-  --> $DIR/target-feature-gate.rs:29:18
+  --> $DIR/target-feature-gate.rs:30:18
    |
 LL | #[target_feature(enable = "avx512bw")]
    |                  ^^^^^^^^^^^^^^^^^^^