Update tests/incremental/thinlto/cgu_keeps_identical_fn.rs

Co-authored-by: Michael Woerister <[email protected]>

Author: Enselic

tests/incremental/thinlto/cgu_keeps_identical_fn.rs

@@ -27,7 +27,7 @@
 #![rustc_expected_cgu_reuse(
     module = "cgu_keeps_identical_fn-bar",
     cfg = "cfail3",
-    kind = "pre-lto"
+    kind = "pre-lto" // Should be "post-lto", see issue #119076
 )]
 
 mod foo {