gh-149584: Use mach_vm_remap in Tachyon

[maurycy]

@pablogsal This is a sneak peak. I'm cooking it for the past two weeks. It's not bad:

Metric	Baseline (main025cc26)	This PR	Change
Work rate	339,576.5 calls/sec	2,925,619.9 calls/sec	8.61x faster
Sample rate	325,989.3 samples/sec	2,202,278.0 samples/sec	6.76x faster
Avg call time	2.94 µs	0.34 µs	-88.4%
Total attempts	979,732	6,612,442	6.75x more
Successful samples	977,970	6,606,845	-
Failed samples	1,762	5,597	-
Success rate	99.82%	99.92%	+0.10 pp
Work efficiency	96.2%	75.3%	-

2026-06-04T00:00:55.450053000+0200 maurycy@gimel /Users/maurycy/src/github.com/maurycy/cpython (vmremap 25e012d) % sudo ./python.exe Tools/inspection/benchmark_external_inspection.py --duration 3
[...]
Basic Statistics:
Wall time: 3.000 seconds
Total attempts: 6,612,442
Successful samples: 6,606,845
Failed samples: 5,597
Success rate: 99.92%
Performance Metrics:
Average call time: 0.34 µs
Work rate: 2925619.9 calls/sec
Sample rate: 2202278.0 samples/sec
Total work time: 2.260 seconds
Work efficiency: 75.3%

v.

2026-06-04T00:03:25.240297000+0200 maurycy@gimel /Users/maurycy/work/cpython-main (main 025cc26) % sudo ./python.exe Tools/inspection/benchmark_external_inspection.py --duration 3
============================================================
get_stack_trace() Benchmark Results
============================================================
Basic Statistics:
Wall time: 3.000 seconds
Total attempts: 979,732
Successful samples: 977,970
Failed samples: 1,762
Success rate: 99.82%
Performance Metrics:
Average call time: 2.94 µs
Work rate: 339576.5 calls/sec
Sample rate: 325989.3 samples/sec
Total work time: 2.885 seconds
Work efficiency: 96.2%

• Issue: _remote_debugging: reading whole pages over and over #149584

[maurycy]

It's still work in progress. I aimed to open this in maurycy/cpython.