[roll] Roll fuchsia Revert "[starnix][mm] Switch to RangeMap2"

This reverts commit 4ba65d600dfb847d55765c0413080ca466743830.

Reason for revert: Causes frequent Starnix panic, b/411518340

Original-Bug: b/392735168
Original change's description:
> [starnix][mm] Switch to RangeMap2
>
> This CL switches the Starnix MemoryManager to use the RangeMap
> implementation. The new RangeMap implementation uses 5 MiB less memory
> on typical workload and is faster:
>
> ```
> Test case                                                                        Improve/regress?  Factor change  Mean before               Mean after
> -------------------------------------------------------------------------------  ----------------  -------------  ------------------------  -------------------------
> fuchsia.fidl_microbenchmarks: CPP/Decode/Table/Unset/16/Steps.Teardown/WallTime  regressed         1.000-1.015    127.23 +/- 0.24 ns        128.19 +/- 0.70 ns
> fuchsia.microbenchmarks.starnix: ForkMultiple/64.fork                            regressed         1.004-1.027    18919215 +/- 134558 ns    19213121 +/- 82571 ns
> fuchsia.microbenchmarks.starnix: ForkMultiple/8.fork                             regressed         1.003-1.022    2351133 +/- 14514 ns      2380439 +/- 8471 ns
> fuchsia.microbenchmarks.starnix: ForkMultipleNested/64.fork                      regressed         1.006-1.023    27651024 +/- 121743 ns    28047858 +/- 119788 ns
> fuchsia.microbenchmarks.starnix: ForkMultipleNested/64.wait                      improved          0.980-0.997    7915500 +/- 52420 ns      7820997 +/- 14896 ns
> fuchsia.microbenchmarks.starnix: ForkMultipleNested/8.fork                       regressed         1.005-1.024    3144786 +/- 19676 ns      3189831 +/- 10624 ns
> fuchsia.microbenchmarks.starnix: ForkMultipleNested/8.wait                       improved          0.985-1.000    873379 +/- 3888 ns        866946 +/- 2537 ns
> fuchsia.microbenchmarks.starnix: ProcessSpawn                                    regressed         1.000-1.011    1644517 +/- 5333 ns       1653608 +/- 3379 ns
> fuchsia.microbenchmarks: Vmo/Clone/MapParent16segments/32768kbytes.clone         regressed         1.004-1.050    71071 +/- 1045 ns         72962 +/- 556 ns
> fuchsia.microbenchmarks: Vmo/Clone/MapParent1segments/32768kbytes.clone          regressed         1.004-1.049    70515 +/- 974 ns          72342 +/- 592 ns
> fuchsia.microbenchmarks: Vmo/Clone/MapParent1segments/32768kbytes.close          regressed         1.000-1.028    137133 +/- 1005 ns        139054 +/- 864 ns
> fuchsia.microbenchmarks: Vmo/Clone/MapParent512segments/32768kbytes.clone        regressed         1.005-1.054    71160 +/- 1114 ns         73240 +/- 622 ns
> fuchsia.microbenchmarks: Vmo/Clone/MapParent8192segments/32768kbytes.clone       regressed         1.005-1.055    71779 +/- 996 ns          73916 +/- 779 ns
> fuchsia.starnix.gvisor_benchmarks: MapTouchMany/4096                             improved          0.547-0.567    124423541 +/- 753155 ns   69287694 +/- 877064 ns
> fuchsia.starnix.gvisor_benchmarks: MapTouchMany/512                              improved          0.915-0.958    8693252 +/- 90227 ns      8138916 +/- 102972 ns
> fuchsia.starnix.gvisor_benchmarks: ThreadStart/2048                              improved          0.863-0.945    508857672 +/- 5907064 ns  459887029 +/- 15539489 ns
>
> ```
>
> The new RangeMap data structure also supports copy-on-write semantics,
> but Starnix does not use the copy-on-write functionality in this CL. We
> can start using that functionality in a later CL.
>
> Original-Bug: b/392735168
> Change-Id: I8411b898f2a193a36465ed5f6a4ebcc344e94346
> Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1254551
> Reviewed-by: Adam Perry <adamperry@google.com>
> Fuchsia-Auto-Submit: Adam Barth <abarth@google.com>
> Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>

Original-Bug: b/392735168
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1255352
Original-Revision: 5d07fe5071a67952267d97e04318a6a6e5eb127f
GitOrigin-RevId: 74dbfd7791075edcd511d09a09af01ae48af848e
Change-Id: Ib5357d34f68ea45f9ec1cf374228b5a3f61eeab3