Fix GH-15901: phpdbg: Assertion failure on `i funcs`

New hash tables are not automatically packed, so we must not treat them
as such. Therefore we guard the foreach appropriately.

Fix GH-15901: phpdbg: Assertion failure on `i funcs`

New hash tables are not automatically packed, so we must not treat them
as such. Therefore we guard the foreach appropriately.

Closes GH-15929.

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