Compiler: file_get_contents data:// inline concat + offset/length (#18613)

[PurHur]

Summary

• Fix compiler inline call-arg producer wiring when file_get_contents() takes an inline string concat as arg 0 plus hoisted false/null context args and embedded offset/length literals.
• Root cause: callArgsAreDistinctInlineTemporaries() rejected calls with trailing embedded literal args, so the Concat prelude was never collected and arg 0 bound to a hoisted false ConstFetch → empty path ValueError.
• PHP implementation in lib/Compiler.php (hoistedCallArgsAreDistinctInlineTemporaries); no C runtime change.

php-src reference

• ext/standard/file.c — php_file_get_contents_ex data URI slice with offset/maxlen
• Zend behavior: file_get_contents('data://text/plain,'.$payload, false, null, 3, 4) → 3456

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php test/repro/maintainer_file_get_contents_data_offset.php
php bin/vm.php test/repro/maintainer_file_get_contents_data_offset.php
'
# Zend: 3456
# VM:   3456

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
vendor/bin/phpunit --filter file_get_contents_data_offset
vendor/bin/phpunit --filter testFileGetContentsInlineConcatFalseNullOffsetLengthUsesProducerSlots
'
# OK (compliance VM+JIT + unit slot guard)

Closes #18613

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