ext/Intl: Return PHP_INT_MIN as int from MessageFormatter::parse() on 64-bit

[LamentXU123]

Cleaning up. -ZEND_LONG_MAX does not equals to ZEND_LONG_MIN, because signed integer ranges are not symmetric
in 64-bit

-ZEND_LONG_MAX = -9223372036854775807
ZEND_LONG_MIN = -9223372036854775808

This makes -9,223,372,036,854,775,808 in MessageFormatter be degraded into float, but it could be an integer.

<?php

$fmt = new MessageFormatter('en_US', '{0,number,integer}');
$parsed = $fmt->parse('-9,223,372,036,854,775,808');
var_dump($parsed);

$parsed = MessageFormatter::parseMessage('en_US', '{0,number,integer}', '-9,223,372,036,854,775,808');
var_dump($parsed);

?>

result in

array(1) {
  [0]=>
  float(-9.223372036854776E+18)
}
array(1) {
  [0]=>
  float(-9.223372036854776E+18)
}

But it should be

array(1) {
  [0]=>
  int(-9223372036854775808)
}
array(1) {
  [0]=>
  int(-9223372036854775808)
}

Reproduce

This is really a super super edge case. I don't even sure we should treat this as a bug fix or a refactor at this point. It really do come into my mind when I am looking at this code that I don't even think we need any NEWS or UPGRADING entry for this little fix. No similar bugs in the code base.

[devnexen]

Anyhow, I ll look into it in your intl PRs in one swoop later.