Rollup merge of rust-lang#131256 - RalfJung:f16-f128-const, r=ibraheemdev

move f16/f128 const fn under f16/f128 feature gate

The `*_const` features were added to work around rust-lang#129656, which should not be needed any more.

Author: matthiaskrgr

tests/ui/transmute_float_to_int.fixed

@@ -1,7 +1,7 @@
 #![warn(clippy::transmute_float_to_int)]
 #![allow(clippy::missing_transmute_annotations)]
-#![feature(f128, f128_const)]
-#![feature(f16, f16_const)]
+#![feature(f128)]
+#![feature(f16)]
 
 fn float_to_int() {
     let _: u32 = unsafe { 1f32.to_bits() };

tests/ui/transmute_float_to_int.rs

@@ -1,7 +1,7 @@
 #![warn(clippy::transmute_float_to_int)]
 #![allow(clippy::missing_transmute_annotations)]
-#![feature(f128, f128_const)]
-#![feature(f16, f16_const)]
+#![feature(f128)]
+#![feature(f16)]
 
 fn float_to_int() {
     let _: u32 = unsafe { std::mem::transmute(1f32) };