php-in-php: re-delete ParseStrUserScriptDelimitedJit — MultipartRuntime PHP makes #18548 obsolete (#18643)

[PurHur]

Summary

• Delete lib/JIT/Builtin/ParseStrUserScriptDelimitedJit.php (~1052 LOC hand-LLVM) restored temporarily in Fix AOT link: restore parse_str delimited LLVM for multipart refresh (#1492) #18548 for StringMultipartStandaloneLlvm link symbols.
• php-in-php: delete StringMultipartStandaloneLlvm — MultipartRuntime PHP bridge (#13031) #18615 already routes user-script multipart through MultipartNativeJitHelper + ParseStrNativeJitHelper PHP; ParseStrRuntime::ensureUserScriptLinked no longer calls ensureSubhelpers.
• Align SuperglobalsBracketRuntimeStandaloneTest with ParseStrRuntimeShrinkTest — expect __compiler_parse_str bridges, not __phpc_parse_str_* LLVM.

Closes #18643

C runtime shrink

Removed	Lines
lib/JIT/Builtin/ParseStrUserScriptDelimitedJit.php	−1052

Verification

php vendor/bin/phpunit test/unit/ParseStrRuntimeShrinkTest.php
# OK (13 tests, 63 assertions)

php vendor/bin/phpunit test/unit/SuperglobalRefreshRuntimeShrinkTest.php
# OK (4 tests)

php vendor/bin/phpunit test/unit/JIT/SuperglobalsBracketRuntimeStandaloneTest.php
# OK (4 tests)

php script/check-selfhost-spine-coverage-sync.php
# OK (spine covers all 4774 inventory files)

php script/bootstrap-inventory.php --check
# OK 4774/4774

make bootstrap-selfhost-vm-driver-execute-probe
# bootstrap-selfhost-vm-driver-execute-probe: OK

Note: ./script/check-aot-build-smoke.sh fails on master too (pre-existing __value__writeHashtable module-verify regression); not introduced by this diff.

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