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Add RVALUE_OLD_AGE to GC::INTERNAL_CONSTANTS for MMTk #734

Job	Run time
ruby-bench (--warmup=1 --bench=1)	15m 25s
make (check, --disable-yjit)	7m 41s
make (check, --enable-shared --enable-load-relative)	7m 58s
make (check, i686)	11m 45s
make (check, cppflags=-DVM_CHECK_MODE)	8m 58s
make (test-bundled-gems)	20m 5s
make (test-bundler-parallel, 50)	23m 41s
make-ibm	0s
make (check, ubuntu-24.04, capi)	9m 17s
Ubuntu result	4s
	1h 44m 54s