8231553: Deprecate unused G1RSetScanBlockSize command line option

Reviewed-by: lkorinth, sjohanss

Author: Thomas Schatzl

src/hotspot/share/runtime/arguments.cpp

@@ -533,6 +533,7 @@ static SpecialFlag const special_jvm_flags[] = {
   { "FieldsAllocationStyle",        JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
   { "CompactFields",                JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
   { "MonitorBound",                 JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
+  { "G1RSetScanBlockSize",          JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
 
   // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
   { "DefaultMaxRAMFraction",        JDK_Version::jdk(8),  JDK_Version::undefined(), JDK_Version::undefined() },