Use default alloc error handler in liballoc

src/lib.rs

@@ -1,7 +1,6 @@
 #![no_std]
 #![feature(
     asm_const,
-    alloc_error_handler,
     core_intrinsics,
 )]
 
@@ -42,11 +41,6 @@ fn panic_handler(info: &core::panic::PanicInfo) -> ! {
     core::intrinsics::abort();
 }
 
-#[alloc_error_handler]
-fn alloc_error_handler(_: core::alloc::Layout) -> ! {
-    core::intrinsics::abort();
-}
-
 #[cfg(target_pointer_width = "32")]
 const HEAP_OFF: usize = 0x4000_0000;