php-in-php: route JIT strip_tags through StripTagsJitHelper (#9196)

[PurHur]

Summary

• Route JIT __compiler_strip_tags through compiled StripTagsJitHelper PHP (self-contained tag parser mirroring VmString::stripTags, php-src ext/standard/string.c).
• Rename StringStripTagsJit.php → StringStripTagsStandaloneLlvm.php and gate to LOAD_TYPE_STANDALONE only (AOT native link; same pattern as LastErrorRuntime / LastErrorRuntimeLlvm).
• Delete default JIT LLVM tag-parser path from StringStripTags.php; add shrink/standalone unit guards.

php-src reference

• php/php-src ext/standard/string.c — PHP_FUNCTION(strip_tags), php_strip_tags_ex
• PHP SSOT: ext/standard/VmString.php (VM); JIT runtime: ext/standard/StripTagsJitHelper.php

C runtime shrink

• lib/JIT/Builtin/StringStripTagsJit.php removed from default JIT link (renamed/gated to standalone-only StringStripTagsStandaloneLlvm.php)
• JIT path: thin bridge in lib/JIT/Builtin/StringStripTags.php → compiled PHP helper

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php -r "var_export(strip_tags(\"<b>x</b>\", \"<b>\")); echo \"\n\";"
php bin/vm.php -r "var_export(strip_tags(\"<b>x</b>\", \"<b>\")); echo \"\n\";"
php bin/jit.php -r "var_export(strip_tags(\"<b>x</b>\", \"<b>\")); echo \"\n\";"'
# '<b>x</b>' on Zend, VM, JIT

php vendor/bin/phpunit --filter "StripTags|SuperglobalsStripTags"
# OK (4 tests, 14 assertions)

php vendor/bin/phpunit --filter strip_tags_jit
# OK (2 tests)

php vendor/bin/phpunit --filter "AotTest.*strip_tags[^_]"
# OK (1 test)

Closes #9196

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