Params const optimization is not a constant in all cases

[dedmen]

params ["_unit", "_pos", ["_target", objNull], ["_buildings", []]];
_buildings pushBack [1,2,3];

Compiles fine.
But after first run, assembly prints this

push ["_unit","_pos",["_target",<NULL-object>],["_buildings",[[1,2,3]]]]
callFunction params;

pushBack modified the reference inside the compiled script.
Need to insert + operator call between the const array and params call, if the default values contain an array because otherwise the array will leak into the script.

https://github.com/dedmen/ArmaScriptCompiler/blob/master/src/optimizer/optimizerModuleConstantFold.cpp#L230

[dedmen]

Fixed in b2d55a6