Fix GC liveness check in ByRefLocals test

Fix dotnet#40751

src/tests/Loader/CollectibleAssemblies/ByRefLocals/ByRefLocals.cs

@@ -54,13 +54,17 @@ static int HoldAssembliesAliveThroughByRefFields(out GCHandle gch1, out GCHandle
  Console.WriteLine(span2[0]);
  GC.Collect(2);
  GC.WaitForPendingFinalizers();
- if (gch1.Target == null)
+ // The loop may be unrolled, in which case things won't be live on the final iteration.
+ if (i < 9)
  {
- return 1;
- }
- if (gch2.Target == null)
- {
- return 2;
+ if (gch1.Target == null)
+ {
+ return 1;
+ }
+ if (gch2.Target == null)
+ {
+ return 2;
+ }
  }
  }
 
@@ -110,4 +114,4 @@ private static ReadOnlySpan<byte> CreateAssemblyDynamically(out GCHandle gchToAs
  return spanAccessor.GetSpan();
  }
 
-}
+}