Auto merge of rust-lang#138197 - Zalathar:assemble-cycle, r=<try>

(DO NOT MERGE) Investigating bootstrap cycle

r? ghost

try-job: aarch64-apple

Author: bors

src/bootstrap/src/core/build_steps/compile.rs

@@ -992,6 +992,7 @@ impl Step for Rustc {
     }
 
     fn make_run(run: RunConfig<'_>) {
+        // dummy change
         let crates = run.cargo_crates_in_set();
         run.builder.ensure(Rustc {
             compiler: run

tests/ui/instrument-coverage/bad-value.rs

@@ -1,5 +1,5 @@
 //@ revisions: blank bad
-//@ [blank] compile-flags: -Cinstrument-coverage=
+//@ [blank] compile-flags: -Cinstrument-coverage=_
 //@ [bad] compile-flags: -Cinstrument-coverage=bad-value
 
 fn main() {}