RFR(T): 8239873: [TESTBUG] FieldLayout/OldLayoutCheck.java fails after the fix for JDK-8239503

[Daniel D. Daugherty]

Greetings,

I'm trying to reduce the noise in the jdk/jdk CI. There is a trivial fix
for this bug:

     JDK-8239873 [TESTBUG] FieldLayout/OldLayoutCheck.java fails after 
the fix for JDK-8239503
     https://bugs.openjdk.java.net/browse/JDK-8239873

Thanks to David Holmes for suggesting looking for an @requires style fix.

Here's the context diff:

$ hg diff
diff -r 57849c7f9d22 
test/hotspot/jtreg/runtime/FieldLayout/OldLayoutCheck.java
--- a/test/hotspot/jtreg/runtime/FieldLayout/OldLayoutCheck.java Wed Feb 
26 19:41:39 2020 -0500
+++ b/test/hotspot/jtreg/runtime/FieldLayout/OldLayoutCheck.java Thu Feb 
27 10:48:22 2020 -0500
@@ -28,7 +28,7 @@
   * @library /test/lib
   * @modules java.base/jdk.internal.misc
   *          java.management
- * @requires vm.bits == "64" & vm.gc != "Z"
+ * @requires vm.bits == "64" & vm.opt.final.UseCompressedOops == true & 
vm.gc != "Z"
   * @run main/othervm -XX:+UseCompressedClassPointers 
-XX:-UseEmptySlotsInSupers OldLayoutCheck
   */


This fix has been verified via a Mach5 Tier7 job set. Without the fix,
there are 18 runs of this test with 6 failures. With the fix, there are
just the 12 passing runs of this test.

Thanks, in advance, for any comments, questions or suggestions.

Dan