Fix AOT CGI superglobal refresh: QUERY_STRING populates $_GET (closes #18832)

[PurHur]

Summary

• Restores init-safe ParseStrUserScriptDelimitedJit LLVM delimited parser removed in php-in-php: re-delete ParseStrUserScriptDelimitedJit — MultipartRuntime PHP makes #18548 LLVM restore obsolete (#1492) #18643
• Routes user-script __superglobals__refresh form/cookie parsing through __phpc_parse_str_parse_delimited_pairs on raw libc C strings instead of broken nested ParseStrNativeJitHelper stubs
• Fixes examples/001-SimpleWeb AOT smoke: QUERY_STRING=name=Smoke now yields <h1>Hello Smoke</h1>

Root cause

Under PHP_COMPILER_AOT_USER_SCRIPT=1, nested JIT of ParseStrNativeJitHelper during thin standalone init emits single-block no-op helpers. __compiler_parse_str bridge called those stubs, so $_GET/$_REQUEST stayed empty while $_SERVER['QUERY_STRING'] was set correctly.

Verification

./script/docker-exec.sh -- bash -lc 'php vendor/bin/phpunit test/unit/JIT/SuperglobalsBracketRuntimeStandaloneTest.php test/unit/SuperglobalRefreshRuntimeShrinkTest.php'
# OK (4 tests, 17 assertions)

./script/docker-exec.sh -- bash -lc 'php vendor/bin/phpunit test/aot/RuntimeSuperglobalRefreshTest.php --filter testTwoRequestsDifferentQueryString'
# OK (1 test, 7 assertions)

./script/docker-exec.sh -- bash -lc '
PHPC=/compiler/phpc
$PHPC build -o /tmp/simpleweb /compiler/examples/001-SimpleWeb/example.php
env QUERY_STRING=name=Smoke SCRIPT_NAME=/example.php REQUEST_URI=/example.php?name=Smoke /tmp/simpleweb | grep "<h1>Hello Smoke</h1>"
'
# <h1>Hello Smoke</h1>

Closes #18832

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