exec: do not use error_mem_read
We will soon reach this case when doing (unaligned) accesses that span partly past the end of memory. We do not want to crash in that case. unassigned_mem_ops and rom_mem_ops are now the same. Reviewed-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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