Rollup merge of rust-lang#69249 - LeSeulArtichaut:stabilize-logs-consts, r=sfackler

Stabilize {f32, f64}::{LOG2_10, LOG10_2}

Following the decision to stabilize `LOG2_10` and `LOG10_2` in rust-lang#50540 (comment).

Closes rust-lang#50540.
r? @sfackler

Author: JohnTitor

src/libcore/num/f32.rs

@@ -130,15 +130,15 @@ pub mod consts {
     pub const LOG2_E: f32 = 1.44269504088896340735992468100189214_f32;
 
     /// log<sub>2</sub>(10)
-    #[unstable(feature = "extra_log_consts", issue = "50540")]
+    #[stable(feature = "extra_log_consts", since = "1.43.0")]
     pub const LOG2_10: f32 = 3.32192809488736234787031942948939018_f32;
 
     /// log<sub>10</sub>(e)
     #[stable(feature = "rust1", since = "1.0.0")]
     pub const LOG10_E: f32 = 0.434294481903251827651128918916605082_f32;
 
     /// log<sub>10</sub>(2)
-    #[unstable(feature = "extra_log_consts", issue = "50540")]
+    #[stable(feature = "extra_log_consts", since = "1.43.0")]
     pub const LOG10_2: f32 = 0.301029995663981195213738894724493027_f32;
 
     /// ln(2)

src/libcore/num/f64.rs

@@ -126,15 +126,15 @@ pub mod consts {
     pub const E: f64 = 2.71828182845904523536028747135266250_f64;
 
     /// log<sub>2</sub>(10)
-    #[unstable(feature = "extra_log_consts", issue = "50540")]
+    #[stable(feature = "extra_log_consts", since = "1.43.0")]
     pub const LOG2_10: f64 = 3.32192809488736234787031942948939018_f64;
 
     /// log<sub>2</sub>(e)
     #[stable(feature = "rust1", since = "1.0.0")]
     pub const LOG2_E: f64 = 1.44269504088896340735992468100189214_f64;
 
     /// log<sub>10</sub>(2)
-    #[unstable(feature = "extra_log_consts", issue = "50540")]
+    #[stable(feature = "extra_log_consts", since = "1.43.0")]
     pub const LOG10_2: f64 = 0.301029995663981195213738894724493027_f64;
 
     /// log<sub>10</sub>(e)