[cs] Make arrayAlloc inline. See #3946

std/cs/Lib.hx

@@ -166,7 +166,7 @@ class Lib
 	/**
 		Allocates a new Haxe Array with a predetermined size
 	**/
-	public static function arrayAlloc<T>(size:Int):Array<T>
+	inline public static function arrayAlloc<T>(size:Int):Array<T>
 	{
 		return @:privateAccess Array.alloc(size);
 	}

tests/unit/src/unit/issues/Issue3946.hx

@@ -5,6 +5,8 @@ class Issue3946 extends Test {
     function test() {
         var arr = cs.Lib.arrayAlloc(10);
         eq(arr.length, 10);
+				arr[0] = 5;
+				eq(arr[0],5);
     }
     #end
 }