Clone VMHashInstance.storage before building an Iterator.
Clone VMHashInstance.storage before building an Iterator.

Otherwise we get ConcurrentModificationException thrown when changing a Hash
while iterating over it.

cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp