php-in-php: strcasecmp()/strncasecmp() JIT via CaseCompareJitHelper — drop libc LLVM (#15225)

[PurHur]

Summary

• Install PHP i8* JIT bridges for strcasecmp()/strncasecmp() via CaseCompareJitHelper + StringCaseCompare (pattern from NaturalCompareJitHelper / php-in-php: delete StringNaturalCompareJit LLVM — route strnatcmp/strnatcasecmp through NaturalCompareJitHelper PHP (#1492) #13535).
• Ext builtins call StringStrcasecmp::ensureLinked / StringStrncasecmp::ensureLinked before dispatch so libc symbols are replaced by compiled PHP helpers.
• Regen bootstrap inventory + spine footnotes 3772/3772.

Closes #15225

C runtime shrink

• JIT strcasecmp/strncasecmp symbols now bridge to VmString::* through compiled PHP instead of libc compare functions on the hot path.

php-src reference

• ext/standard/string.c — PHP_FUNCTION(strcasecmp|strncasecmp)

Test plan

./script/docker-exec.sh -- php bin/vm.php -r 'var_export(strcasecmp("A","a"));'
# int(0)

php vendor/bin/phpunit --filter StrcasecmpRuntimeShrinkTest
# OK (4 tests, 9 assertions)

php script/bootstrap-inventory.php --check
# OK 3772/3772

php script/check-selfhost-spine-coverage-sync.php
# OK (spine covers all 3772 inventory files)

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

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