php-in-php: drop leftover Type always-on xmlrpc ABI shells (#32902)

[PurHur]

Summary

• Remove always-on __compiler_xmlrpc_encode_value / __compiler_xmlrpc_decode shells from Builtin\Type (peer php-in-php: drop leftover Type always-on json ABI shells (ext/json/php_json.c) #32897 json / php-in-php: drop leftover Type dead compiler ABI decls after PHP/IR SSOT (#32139 shape) #32250 xmlrpc_encode_array; trust class Release v1.1.0: fix cold-build-check compile_failed on hello world (LLVM Module.php line 180; re-#24302) #32122).
• Type::initialize now ensureLinkeds StringXmlrpc (owner already getNamedFunction first / ensureBridge creates the symbol if absent).
• Closes php-in-php: drop leftover Type always-on xmlrpc ABI shells (ext/xmlrpc/xmlrpc.c) #32902

php-src: ext/xmlrpc/xmlrpc.c — PHP_FUNCTION(xmlrpc_encode) / xmlrpc_decode

Test plan

• ./script/phpunit.sh --filter 'TypeDeadXmlrpcAbiRuntimeShrinkTest|TypeDeadCompilerAbiRuntimeShrinkTest|TypeDeadJsonAbiRuntimeShrinkTest' → OK (11 tests, 84 assertions)
• PHP_COMPILER_PROFILE=8.4 VM xmlrpc_encode(42) → XML int param (true string check)
• Zend/VM/AOT json_encode/serialize neighbor sanity → {"a":1}|a:2:{…}
• ./script/aot-smoke.sh → 8 passed, 0 failed
• Note: AOT xmlrpc_encode compile-time path (JitXmlrpcCompileTime / Variable::integer()) is pre-existing red on master (xmlrpc_encode_scalar fixture); not regressed by this ABI-shell drop

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