Perf: typed int **93 / pow(n,93) chained smul omit llvm.pow.f64 (#36386)

[PurHur]

Summary

• Part of Performance: v2.0 targets and the codegen roadmap to reach them — typed code ≥ 3x Zend, untyped ≤ 1.5x slower, web request ≥ php-fpm: inline caches for property/method access, escape analysis for arrays/strings, guarded speculation, per-function O1 by default (lib/JIT.php, lib/JIT/Builtin/Type/Object_.php, lib/JIT/Analyzer.php) #36386 (typed fast-path successor of Perf: generated code is 4-14x SLOWER than Zend on basic loops and calls #23483). Lane overflow: CI: php-llvm-structgep-assert.patch fails to apply — blocks north-star5-verify-fast and all bootstrap gates #36143–VM: 1M-iteration loops exit 255 silently — restore compute-suite headroom on bin/vm.php #36148 / RunForge north star (Sep 2026): trust, build speed, performance — automation tracker #36142 children closed; Performance: benchmark suite v2 — the benchmark-game set plus web-request and real-app workloads, per-commit history in JSON, a public chart page, and bench-gate extended to all of it (benchmarks/, script/bench-gate.php, docs/pages/bench.html) #36385 claimed <48h.
• Lower compile-time **93 / pow($n, 93) via (ninetysecond×n) chained smul.with.overflow in JitPowIntegerEmitHigh — omit llvm.pow.f64.
• Append-only: keeps the **92 (ninetysecond) block intact.
• php-src: Zend/zend_operators.c pow_function / zend_pow / mul_function; ext/standard/math.c PHP_FUNCTION(pow).

Closes nothing (epic remains open). Part of #36386.

Test plan

• ./script/phpunit.sh --filter NoThrowPowNinetythirdMulAotTest → OK (4 tests, 23 assertions)
• AOT vs Zend for pow_ninetythird_smul_36386.php and pow_ninetysecond_smul_36386.php (match; odd (-1)**93 === -1)
• script/differential-sweep.sh --aot --repeat 3 --dir build/audit/diff-pow93 → 3/3 (ninetyfirst/ninetysecond/ninetythird)
• ./script/aot-smoke.sh → 9/9
• make north-star5-verify-fast → OK (spine 8591/8591)

Not covered this run: full corpus differential-sweep.sh --aot --repeat 3 (prior host sweep SIGTERM mid-run; targeted ninety* set green).

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