Parallel Sweep [DRAFT] #12878

Job	Run time
ruby-bench (--warmup=1 --bench=1 --excludes=shipit)	14m 35s
make (check, cppflags=-DVM_CHECK_MODE)	4m 43s
make (check, i686)	3m 6s
make (check, ubuntu-24.04, capi)	4m 53s
make (check, --disable-yjit)	4m 38s
make (test-bundled-gems)	13m 5s
make (test-bundler-parallel, 50)	21m 30s
make (check, --enable-shared --enable-load-relative)	5m 24s
make-ibm	0s
Ubuntu result	2s
	1h 11m 56s

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