Rollup merge of #106323 - starkat99:stabilize-f16c_target_feature, r=…

…petrochenkov

Stabilize f16c_target_feature

Resolves rust-lang/stdarch#1234

Library PR for stabilizing corresponding intrinsics: rust-lang/stdarch#1366

See also #44839 tracking issue for target_feature

core/src/lib.rs

@@ -239,7 +239,6 @@
 #![feature(arm_target_feature)]
 #![feature(avx512_target_feature)]
 #![feature(cmpxchg16b_target_feature)]
-#![feature(f16c_target_feature)]
 #![feature(hexagon_target_feature)]
 #![feature(mips_target_feature)]
 #![feature(powerpc_target_feature)]
@@ -248,6 +247,7 @@
 #![feature(sse4a_target_feature)]
 #![feature(tbm_target_feature)]
 #![feature(wasm_target_feature)]
+#![cfg_attr(bootstrap, feature(f16c_target_feature))]
 
 // allow using `core::` in intra-doc links
 #[allow(unused_extern_crates)]