Repeating string with `x' operator more than 2^31 times
(e.g. "my $s = 'a' x (2**31+1);").
Computed string becomes corrupted or the interpreter crashes.
The right site of `x' operator has been limited to 2^31 to
prevent from wrapping internal representation of the count.
It's not possible to repeat string more than 2^31 times and
thus corrupt memory or crash the interpreter. If user
supplies bigger count, the interpreter will raise an