php-in-php: LocaleParser always JitVmHelperLink (#20101)

[PurHur]

Summary

• Drop UserScriptAotDeferNestedJit::shouldDefer early-return from LocaleParser so user-script / thin standalone AOT still links __phpc_jit_locale_get_* via JitVmHelperLink → LocaleParserJitHelper → VmLocale
• Keep NestedJitCompileScope re-entrancy guard; embed path unchanged
• Add LocaleParserRuntimeShrinkTest guarding no NestedJIT defer class remains

Closes #20101

C / NestedJIT shrink

• Deleted UserScriptAotDeferNestedJit import + early-return from lib/JIT/Builtin/LocaleParser.php (−7 / +4 net in that file)
• No new C; PHP helper path only

php-src reference

• ext/intl/locale/locale_methods.c — locale_get_primary_language / region / script

Test plan

• vendor/bin/phpunit test/unit/LocaleParserRuntimeShrinkTest.php — OK (3 tests)
• vendor/bin/phpunit test/unit/LocaleParseTest.php — OK
• PHP_COMPILER_PROFILE=8.4 user-script AOT dynamic concat → zh|CN|Hans
• make bootstrap-selfhost-vm-driver-execute-probe — OK

Verification transcript

vendor/bin/phpunit test/unit/LocaleParserRuntimeShrinkTest.php
OK (3 tests, 11 assertions)

PHP_COMPILER_PROFILE=8.4 PHP_COMPILER_AOT_USER_SCRIPT=1 ./phpc build -o /tmp/locale_var_us /tmp/locale_var.php
/tmp/locale_var_us
# zh|CN|Hans

make bootstrap-selfhost-vm-driver-execute-probe
# OK /compiler/build/selfhost-lib-spine-smoke

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