php-in-php: drop UserScriptAotDeferNestedJit from LocaleParser — always JitVmHelperLink + LocaleParserJitHelper (#1492) #20101

Category

php-in-php · runtime-shrink (#1492, follow #20028 rename / #20086 StatPath / #17072 locale AOT)

Problem

lib/JIT/Builtin/LocaleParser.php still early-returns on UserScriptAotDeferNestedJit::shouldDefer() before JitVmHelperLink::ensureBridge. User-script / thin standalone AOT never links __phpc_jit_locale_get_* bridges for non-literal locales; embed already uses LocaleParserJitHelper → VmLocale.

#20028 proved the same helper can always route through JitVmHelperLink (NestedJIT of the PHP helper, with env clearing inside the link helper). Locale parsing is pure PHP string work — no libc kernel required.

php-src reference

• php/php-src ext/intl/locale/locale_methods.c — locale_get_primary_language / locale_get_region / locale_get_script

PHP implementation target

• lib/JIT/Builtin/LocaleParser.php — delete UserScriptAotDeferNestedJit import + early return; keep NestedJitCompileScope guard; always JitVmHelperLink::ensureBridge
• test/unit/LocaleParserRuntimeShrinkTest.php — assert no UserScriptAotDeferNestedJit; bridge via JitVmHelperLink + LocaleParserJitHelper

Repro

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
vendor/bin/phpunit test/unit/LocaleParserRuntimeShrinkTest.php test/unit/LocaleParseTest.php test/unit/LocaleDefaultTest.php
make bootstrap-selfhost-vm-driver-execute-probe
'

Done when

• UserScriptAotDeferNestedJit removed from LocaleParser.php
• Always JitVmHelperLink + LocaleParserJitHelper for locale_get_* bridges
• Shrink + Locale unit tests green
• make bootstrap-selfhost-vm-driver-execute-probe green
• PR body cites defer gate deleted

Refs #1492, #17072, #20028, #20086