Add arena allocator#1551
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Adapted from commit 99e9181d117a ("added custom malloc for small
blocks (11% faster on bench-v8)" https://github.com/bellard/quickjs).
Benchmarks:
```
┌─────────────────┬──────┬──────────┬─────────────┬─────────┐
│ Benchmark │ NG │ NG+arena │ NG+arena+mi │ Bellard │
├─────────────────┼──────┼──────────┼─────────────┼─────────┤
│ Richards │ 1207 │ 1221 │ 1221 │ 1210 │
├─────────────────┼──────┼──────────┼─────────────┼─────────┤
│ DeltaBlue │ 1211 │ 1289 │ 1309 │ 1295 │
├─────────────────┼──────┼──────────┼─────────────┼─────────┤
│ Crypto │ 1070 │ 1075 │ 1106 │ 973 │
├─────────────────┼──────┼──────────┼─────────────┼─────────┤
│ RayTrace │ 1977 │ 2883 │ 2942 │ 2866 │
├─────────────────┼──────┼──────────┼─────────────┼─────────┤
│ EarleyBoyer │ 2690 │ 3540 │ 3610 │ 3548 │
├─────────────────┼──────┼──────────┼─────────────┼─────────┤
│ RegExp │ 432 │ 492 │ 499 │ 557 │
├─────────────────┼──────┼──────────┼─────────────┼─────────┤
│ Splay │ 3569 │ 5802 │ 5851 │ 6087 │
├─────────────────┼──────┼──────────┼─────────────┼─────────┤
│ NavierStokes │ 2202 │ 2192 │ 2192 │ 1843 │
├─────────────────┼──────┼──────────┼─────────────┼─────────┤
│ Score (geomean) │ 1511 │ 1783 │ 1817 │ 1764 │
└─────────────────┴──────┴──────────┴─────────────┴─────────┘
```
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Adapted from commit 99e9181d117a ("added custom malloc for small
blocks (11% faster on bench-v8)" https://github.com/bellard/quickjs).
Benchmarks: