Disallow indirect modification on readonly properties within __clone() (#15012)

Indirect modification isn't allowed in __construct() because it allows
references to leak, so it doesn't m

Disallow indirect modification on readonly properties within __clone() (#15012)

Indirect modification isn't allowed in __construct() because it allows
references to leak, so it doesn't make much sense to allow it in __clone().

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Fix indirect readonly error messages (#14979)

$obj->ro[] = 42;, passByRef($obj->ro); and the likes should emit an indirect
modification error message. This message already existed but wa

Fix indirect readonly error messages (#14979)

$obj->ro[] = 42;, passByRef($obj->ro); and the likes should emit an indirect
modification error message. This message already existed but was used
inconsistently.

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Fix readonly+clone JIT issues

Closes GH-10748