memory leak in gawk 3.1.0

[Tony Leneis]

        There's a rather nasty memory leak in gawk 3.1.0 when a next statement
is called from within a for (index in array) loop.  For example, this gawk
program eventually consumes over 100 megs after processing around 2 million
lines:

BEGIN {
  x[1] = 0
}
{
  for (i in x)
    next
}

I assume the for (i in x) construct must allocate some memory that isn't
freed when the loop is exited via the next statement.

-Tony

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