int range returns incorrect result for pow

[kkmuffme]

https://psalm.dev/r/05888237f2

Should be identical, but it's not.
There's a test for it (IntRangeTest pow) but it's wrong there too, as it asserts -1 incorrectly.

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/05888237f2

<?php

$x = (-2) ** 0;
/** @psalm-trace $x */;

/** @var int<0, 0> $c */
$y = (-2) ** $c;
/** @psalm-trace $y */;

Psalm output (using commit 16b24bd):

INFO: Trace - 4:23 - $x: 1

INFO: Trace - 8:23 - $y: -1

INFO: UnusedVariable - 3:1 - $x is never referenced or the value is not used

INFO: UnusedVariable - 7:1 - $y is never referenced or the value is not used