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

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() {}