Add #[cold] to abort and handle_alloc_error

Author: a1phyr

alloc/src/alloc.rs

@@ -360,6 +360,7 @@ extern "Rust" {
 #[stable(feature = "global_alloc", since = "1.28.0")]
 #[cfg(not(any(test, bootstrap)))]
 #[rustc_allocator_nounwind]
+#[cold]
 pub fn handle_alloc_error(layout: Layout) -> ! {
     unsafe {
         __rust_alloc_error_handler(layout.size(), layout.align());

std/src/process.rs

@@ -1779,6 +1779,7 @@ pub fn exit(code: i32) -> ! {
 ///
 /// [panic hook]: crate::panic::set_hook
 #[stable(feature = "process_abort", since = "1.17.0")]
+#[cold]
 pub fn abort() -> ! {
     crate::sys::abort_internal();
 }