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The qstr_last_chunk is not collected by the garbage collector.  This relies
on the assertion that qstr_pool_t also references the qstr_last_chunk.  If
an exception is raised while allocating the qstr_pool_t, qstr_last_chunk
has to be invalidated not to become a dangling reference at the next
garbage collection.
Signed-off-by: Emilie Feral <emilie.feral@numworks.com>