Defer nested-JIT standalone init for bootstrap AOT compile (#14472)

[PurHur]

Summary

• Add StreamIoRuntime::beginStandaloneInitPhase() so ensureFullStandaloneBodies() defers nested php-in-PHP JIT (JsonEncode, Getenv, CliArgv, stream/json stubs) during standalone spine init — fixes exit 139 in loadJitContext() / StringJsonEncode::ensureJitHelperCompiled.
• CliArgv spine init uses thin ensureUserScriptMainStubs during defer; skip StringGetenvAll nested JIT; lazy-link soundex/metaphone/parse_str during defer.
• Link ObOutputRuntime, ValueEchoRuntime, StringRandomBytes in full standalone bodies; skip VM env-probe gate for bootstrap-aot/ entries.
• StringJsonEncode::implement: NestedJitCompileScope guard + insert-block restore for future full ensureLinked lowering.

Root cause (#14472)

Nested jit->compile(JsonEncodeJitHelper) during ensureFullStandaloneBodies segfaulted LLVM 9 after #14470 unblocked CliArgv. Same class as #13245 inventory defer — spine init only needs linkable ABI stubs until user code calls ensureLinked.

Verification

source script/php-env.sh

# Issue repro — compile succeeds (was exit 139)
php bin/compile.php -o /tmp/echo_hello test/bootstrap-aot/echo_hello.php
# exit 0; /tmp/echo_hello created

# loadJitContext standalone init
php -r 'require "vendor/autoload.php"; $r = new PHPCompiler\Runtime(PHPCompiler\Runtime::MODE_AOT); $r->loadJitContext(); echo "ok\n";'
# ok

php vendor/bin/phpunit --filter 'BootstrapAotJitCompileTest::testEchoHelloBootstrapAotCompileDoesNotSegfault|BootstrapAotJitCompileTest::testLoadJitContextStandaloneInitCompletes|CliArgvRuntimeShrinkTest'
# OK (5 tests)

make bootstrap-selfhost-link
# bootstrap-selfhost-link: OK build/selfhost

Handoff

• Runtime execute: compiled echo_hello binary still segfaults at c:main_before_php when run — compile/link gate is green; follow-up needed for AOT main() runtime path.
• json_encode AOT: ensureLinked still needs stub→full upgrade when user code calls json_encode (e.g. test/bootstrap-aot/stdlib_json.php).

Closes #14472

Made with Cursor