8370048: Shenandoah: Deprecated ShenandoahPacing option

Reviewed-by: ysr

Author: William Kemper

src/hotspot/share/runtime/arguments.cpp

@@ -536,6 +536,7 @@ static SpecialFlag const special_jvm_flags[] = {
 #ifdef _LP64
   { "UseCompressedClassPointers",   JDK_Version::jdk(25),  JDK_Version::jdk(26), JDK_Version::undefined() },
 #endif
+  { "ShenandoahPacing",             JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
   // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
   { "CreateMinidumpOnCrash",        JDK_Version::jdk(9),  JDK_Version::undefined(), JDK_Version::undefined() },