[jvm] int parsing inconsistent with other targets

The compiler parsing constant ints for the jvm target appears to be inconsistent with the python, js, interp and legacy java targets, I've not tested the rest. Tested against both Haxe `36263b3` and `4.0.5` with the same results.

```Haxe
package ;

class Main {

public static function main() {
var i32minc:Int = -2147483648;
var i32maxc:Int = 2147483647;
var i32min:Int = Std.int(-Math.pow(2, 31));
var i32max:Int = Std.int(Math.pow(2, 31) - 1);
var jvmmin:Int = -2147450880;
var jvmerr:Int = -2147450881;
// jvm : 0, -1, -2147483648, 2147483647, -2147450880, 32767
// java : -2147483648, 2147483647, -2147483648, 2147483647, -2147450880, -2147450881
// python : -2147483648, 2147483647, -2147483648, 2147483647, -2147450880, -2147450881
// js : -2147483648, 2147483647, -2147483648, 2147483647, -2147450880, -2147450881
// interp : -2147483648,2147483647,0,-1,-2147450880,-2147450881
trace( i32minc, i32maxc, i32min, i32max, jvmmin, jvmerr );
}

}
```