Split-TU: extract InitArraySpreadArithmeticAndNestedInlineCallArgResolvers (#36387)

[PurHur]

Summary

• Part of Performance: compile-time targets and gate — hello-world ≤ 3 s warm, MiniWebApp ≤ 10 s, 400 statements per function in < 5 s, one-file edit rebuild < 25 % of full, spine gen-0 < 30 min with split-TU (script/bench-gate.php --compile, bin/compile.php, lib/Compiler.php) (re-#36224 slice 2, re-#36199) #36387 (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 closed/green). Move-only Concern extract of slotForRecentInitArrayCallArg → nestedInlineFuncCallProducerForCallArg (~641 lines) from SlotForCallArgResolvers into InitArraySpreadArithmeticAndNestedInlineCallArgResolvers.
• Complementary to Split-TU: extract SlotForInlineClosureAndFirstClassCallableCallArgResolvers (#36387) #37058 (Closure/FCC) and Split-TU: extract SlotForPropertyClassConstAndClosureBindCallArgResolvers (#36387) #37061 (Property/ClassConst/ClosureBind). Hub wire + spine require + sidecar stamp; Compiler hub budget 1154→1157; spine 8348→8349.
• php-src: Zend/zend_execute.c ZEND_SEND_* adjacent call-arg wiring — no new C ABI.
• Replaces closed Split-TU: extract InitArraySpreadArithmeticAndNestedInlineCallArgResolvers (#36387) #37062 (branch deleted after tip raced with Split-TU: extract SlotForPropertyClassConstAndClosureBindCallArgResolvers (#36387) #37061).

Test plan

• ./script/aot-smoke.sh → 9/9 + size gate OK
• make north-star5-verify-fast → OK (spine 8349/8349)
• php script/check-selfhost-spine-count-sync.php / sidecar sync / check-size-budgets → OK
• Not run: script/differential-sweep.sh --aot --repeat 3 (move-only)

Part of #36387.

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