Auto merge of rust-lang#102068 - cjgillot:erased-lifetime-print, r=eholk

Always print '_, even for erased lifetimes.

Explicit lifetime arguments are now the recommended syntax in rust 2018 and rust 2021.  This PR applies this discipline to rustc itself.

Author: bors

tests/fail/concurrency/windows_join_detached.stderr

@@ -8,7 +8,7 @@ LL |         let rc = unsafe { c::WaitForSingleObject(self.handle.as_raw_handle(
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
    = note: BACKTRACE:
    = note: inside `std::sys::PLATFORM::thread::Thread::join` at RUSTLIB/std/src/sys/PLATFORM/thread.rs:LL:CC
-   = note: inside `std::thread::JoinInner::<()>::join` at RUSTLIB/std/src/thread/mod.rs:LL:CC
+   = note: inside `std::thread::JoinInner::<'_, ()>::join` at RUSTLIB/std/src/thread/mod.rs:LL:CC
    = note: inside `std::thread::JoinHandle::<()>::join` at RUSTLIB/std/src/thread/mod.rs:LL:CC
 note: inside `main` at $DIR/windows_join_detached.rs:LL:CC
   --> $DIR/windows_join_detached.rs:LL:CC