Bug 19614 – Integral promotion deprecation msg in core.internal.arrayop

core.internal.arrayop does not compile cleanly. A long string of these deprecation warnings shows up: ``` core/internal/arrayop.d-mixin-144(144): Deprecation: integral promotion not done for `-a`, use '-transition=intpromote' switch or `-cast(int)(a)` core/internal/arrayop.d-mixin-57(57): Deprecation: integral promotion not done for `-_param_2[pos]`, use '-transition=intpromote' switch or `-cast(int)(_param_2[pos])` core/internal/arrayop.d-mixin-57(57): Deprecation: integral promotion not done for `-_param_2`, use '-transition=intpromote' switch or `-cast(int)(_param_2)` core/internal/arrayop.d-mixin-57(57): Deprecation: integral promotion not done for `-_param_2[pos]`, use '-transition=intpromote' switch or `-cast(int)(_param_2[pos])` core/internal/arrayop.d-mixin-144(144): Deprecation: integral promotion not done for `-a`, use '-transition=intpromote' switch or `-cast(int)(a)` core/internal/arrayop.d-mixin-57(57): Deprecation: integral promotion not done for `-_param_2[pos]`, use '-transition=intpromote' switch or `-cast(int)(_param_2[pos])` core/internal/arrayop.d-mixin-57(57): Deprecation: integral promotion not done for `-_param_2`, use '-transition=intpromote' switch or `-cast(int)(_param_2)` ``` dlang 2.084

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