Allocate Node objects on arena #101

Job	Run time
docker	1m 17s
thirdparty-tests (test_perl)	37m 41s
thirdparty-tests (test_cello)	18s
thirdparty-tests (test_curl)	10m 8s
thirdparty-tests (test_doom)	16s
thirdparty-tests (test_git)	18m 43s
thirdparty-tests (test_libpng)	2m 19s
thirdparty-tests (test_libuev)	48s
thirdparty-tests (test_lua)	39s
thirdparty-tests (test_metalang99)	42s
thirdparty-tests (test_oniguruma_jq)	1m 10s
thirdparty-tests (test_openssh)	5m 16s
thirdparty-tests (test_openssl)	17m 38s
thirdparty-tests (test_php)	7m 51s
thirdparty-tests (test_postgres)	4m 54s
thirdparty-tests (test_python)	27m 14s
thirdparty-tests (test_qbe_hare)	26s
thirdparty-tests (test_sqlite)	4m 12s
thirdparty-tests (test_tinycc)	47s
thirdparty-tests (test_toxcore)	4m 45s
thirdparty-tests (test_toybox)	1m 2s
thirdparty-tests (test_vim)	1m 57s
thirdparty-tests (test_zlib)	15s
thirdparty-tests (test_zstd)	1m 32s
thirdparty-tests (build_gcc)	10m 31s
thirdparty-tests (build_musl)	1m 24s
thirdparty-tests (build_nano)	1m 17s
thirdparty-tests (build_sdl)	1m 48s
	2h 46m 50s

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