Auto merge of #112049 - Kobzol:pgo-omit-benchmarks, r=<try>

[do not merge] CI experiments

Various CI experiments for try/dist builds.

r? `@ghost`

Author: bors

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -5,6 +5,7 @@ use std::io::{BufWriter, Write};
 use std::ops::{ControlFlow, Deref};
 use std::path::{Path, PathBuf};
 use std::process::{ExitStatus, Output, Stdio};
+use std::time::Instant;
 use std::{env, fmt, fs, io, mem, str};
 
 use cc::windows_registry;
@@ -990,6 +991,20 @@ fn link_natively(
         }
     }
 
+    // Scan the built artifact, lld might keep .ctors/.dtors in it
+    use object::read::Object;
+    use rustc_data_structures::memmap::Mmap;
+
+    let start = Instant::now();
+    let file = std::fs::File::open(&temp_filename).unwrap();
+    let mmap = unsafe { Mmap::map(file).unwrap() };
+    if let Ok(file) = object::read::File::parse(mmap.as_ref()) {
+        if let Some(_section) = file.section_by_name(".ctors") {
+            eprintln!(".ctors found!");
+        }
+    }
+    eprintln!("{}s", start.elapsed().as_secs_f64());
+
     match prog {
         Ok(prog) => {
             let is_msvc_link_exe = sess.target.is_like_msvc