Stdlib: sort() enum arrays use object-handle order like Zend (#5691)

[PurHur]

Summary

• Fix compareEnumCasesForSort() to use stable enum case object-handle order for sort()/rsort()/asort()/arsort(), matching php-src php_array_data_compare_unstable_i / transitive SORT_REGULAR (PR Fix SORT_REGULAR with new transitive comparison functions php/php-src#20517).
• Previously backed enums sorted by backing scalar, diverging from Zend for string-backed enums and declaration orders that do not match backing value order.

Root cause

EnumCaseSupport::compareEnumCasesForSort() used backingValueForMinMax() spaceship for backed enums; php-src compares enum zvals by object pointer/handle, not backing value.

php-src reference

• ext/standard/array.c — php_array_data_compare_unstable_i, php_array_compare_transitive

PHP implementation

• lib/VM/EnumCaseSupport.php — compareEnumCasesForSort()

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php -r "enum E: string { case A=\"b\"; case B=\"a\"; } \$a = [E::B, E::A]; sort(\$a); foreach (\$a as \$v) echo \$v->name, \"\\n\";"
php bin/vm.php -r "enum E: string { case A=\"b\"; case B=\"a\"; } \$a = [E::B, E::A]; sort(\$a); foreach (\$a as \$v) echo \$v->name, \"\\n\";"
php bin/vm.php test/compliance/cases/stdlib/sort_enum_cases.phpt
vendor/bin/phpunit --filter SortEnumCasesBuiltinTest
'

Output:

A
B
A
B
A
B
C
A
B
A
B
C
A
B
PHPUnit ... OK (6 tests, 7 assertions)

Closes #5691

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