RFR (XS/T) 8231946: Remove obsolete and unused ShenandoahVerifyObjectEquals flag

[Aleksey Shipilev]

RFE:
  https://bugs.openjdk.java.net/browse/JDK-8231946

This flag was obsoleted and not used for a while. Let's remove it:

diff -r de43643147c6 src/hotspot/share/gc/shenandoah/shenandoah_globals.hpp
--- a/src/hotspot/share/gc/shenandoah/shenandoah_globals.hpp    Mon Oct 07 15:30:29 2019 +0200
+++ b/src/hotspot/share/gc/shenandoah/shenandoah_globals.hpp    Mon Oct 07 16:07:09 2019 +0200
@@ -315,7 +315,4 @@
           "Tracing task termination timings")                               \
                                                                             \
-  develop(bool, ShenandoahVerifyObjectEquals, false,                        \
-          "Verify that == and != are not used on oops. Only in fastdebug")  \
-                                                                            \
   diagnostic(bool, ShenandoahAlwaysPreTouch, false,                         \
           "Pre-touch heap memory, overrides global AlwaysPreTouch")         \

Testing: x86_64 build, hotspot_gc_shenandoah (running)

-- 
Thanks,
-Aleksey