bug#20268: 25.0.50; pcase-lambda broken

[Leo Liu]

After the recent rewrite, pcase-lambda is broken. For example, eval the
following to get 46422 instead of the correct value 65535.

   (cl-some (pcase-lambda (`[fullsweep_after ,v]) v)
            '([min_bin_vheap_size 46422]
              [min_heap_size 233]
              [fullsweep_after 65535]
              [minor_gcs 40]))

Thanks,
Leo