Fix GH-16574: Incorrect error "undefined method" messages

The `get_method` object handler may change the object pointer. SPL does
this in its iterator implementations. This causes the er

Fix GH-16574: Incorrect error "undefined method" messages

The `get_method` object handler may change the object pointer. SPL does
this in its iterator implementations. This causes the error message
to change to another class which is confusing to the user. JIT handles
this correctly. This patch aligns behaviour with JIT.

Closes GH-16576.

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