Stabilize the breakpoint function

Stabilization report and FCP in
#133724.

Author: joshtriplett

library/core/src/arch.rs

@@ -70,8 +70,7 @@ pub macro global_asm("assembly template", $(operands,)* $(options($(option),*))?
 ///
 /// - On x86 targets, this produces an `int3` instruction.
 /// - On aarch64 targets, this produces a `brk #0xf000` instruction.
-// When stabilizing this, update the comment on `core::intrinsics::breakpoint`.
-#[unstable(feature = "breakpoint", issue = "133724")]
+#[stable(feature = "breakpoint", since = "CURRENT_RUSTC_VERSION")]
 #[inline(always)]
 pub fn breakpoint() {
     core::intrinsics::breakpoint();

library/core/src/intrinsics/mod.rs

@@ -312,7 +312,7 @@ pub unsafe fn prefetch_write_instruction<T>(data: *const T, locality: i32);
 
 /// Executes a breakpoint trap, for inspection by a debugger.
 ///
-/// This intrinsic does not have a stable counterpart.
+/// The stabilized version of this intrinsic is [`core::arch::breakpoint`].
 #[rustc_intrinsic]
 #[rustc_nounwind]
 pub fn breakpoint();

tests/assembly/breakpoint.rs

@@ -3,7 +3,6 @@
 //@[aarch64] only-aarch64
 //@[x86_64] only-x86_64
 
-#![feature(breakpoint)]
 #![crate_type = "lib"]
 
 // CHECK-LABEL: use_bp