[PHP] perf: avoid per-mmap gap sort allocation#751
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Supersedes fork-headed PR #731. This replacement keeps the same head commit (bb8a322) but moves the PR head onto an Automattic/kandelo branch.
Why this is needed
The PHPT suite performs enough mmap-heavy work that avoidable per-mmap allocation overhead becomes visible. Slow memory mapping makes broad test coverage unnecessarily expensive.
Why this shape makes sense
The change improves the allocator and search path used by the kernel instead of reducing PHP coverage. It keeps the test harness honest while removing runtime overhead.
Why this is the correct fix
Avoiding a per-mmap gap sort allocation preserves behavior while reducing repeated work in a hot path. That is the right kind of throughput improvement for harness-scale workloads.
Verification
Branch-location correction only. Replacement head SHA matches fork-headed PR #731 exactly.