[PurHur]

Summary

• Fix firstSiblingInlineFuncCallProducerIndex trimming the leftmost hoisted producer when php-cfg lowers var_dump(strlen($s), substr($s, 0, 2)) and var_dump(ftell($f), fgetc($f)) after stmt-level stream calls — each arg now gets its own FUNCCALL_EXEC_RETURN slot (Regression: var_dump() multi-arg — nested builtin calls misbind first arg slot (re-#11144, ext/standard/var.c) #16254, Stdlib: var_dump() multi-arg — gettype() operand dumps as resource not string (ext/standard/var.c) #16269).
• Exclude stmt-level array pointer mutators (next/prev/reset/end/pos) from outer sibling producer lists so var_export(key($a), true) after next($a) wires key() not next() (Regression: key() string-concat nested operand — returns true not key (ext/standard/array.c) #13829).
• PHP-in-PHP: all logic in lib/Compiler.php producer-slot wiring; no runtime/ changes.

php-src reference: ext/standard/var.c (php_var_dump), ext/standard/array.c (php_next, php_key).

Test plan

./vendor/bin/phpunit test/unit/VarDumpMultiargBuiltinMisbindTest.php
php bin/vm.php test/repro/maintainer_gap_var_dump_multiarg_builtin_misbind.php
php bin/vm.php test/repro/maintainer_gap_var_dump_multiarg_stream.php
./vendor/bin/phpunit test/unit/InlineCallArgProducerSlotTest.php --filter VarExportNestedArrayPointer
./vendor/bin/phpunit test/compliance/VMTest.php --filter array_pointer_var_export_concat

Verification output (VM):

int(5)
string(2) "he"
int(2)
string(1) "c"

resource(N) of type (stream)
string(8) "resource"
gettype=resource
fwrite=2

Closes #16254
Closes #16269
Closes #13829

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