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Preserve usable slot size when RVALUE_OVERHEAD is non-zero #775

Job	Run time
ruby-bench (--warmup=1 --bench=1 --excludes=shipit)	14m 1s
make (check, --enable-shared --enable-load-relative)	8m 2s
make (check, cppflags=-DVM_CHECK_MODE)	9m 23s
make (check, i686)	17m 10s
make (test-bundled-gems)	12m 38s
make (check, ubuntu-24.04, capi)	10m 6s
make (check, --disable-yjit)	7m 27s
make (test-bundler-parallel, 50)	22m 16s
make-ibm	0s
Ubuntu result	3s
	1h 41m 6s