[1/6] msvcirt: Add a partial implementation of class ostream_withassign.

[Iván Matellanes]

On 05/08/16 12:22, Piotr Caban wrote:
>>  /* ??0ostream@@QAE at PAVstreambuf@@@Z */
>>  /* ??0ostream@@QEAA at PEAVstreambuf@@@Z */
>> +/* ??0ostream_withassign@@QAE at PAVstreambuf@@@Z */
>> +/* ??0ostream_withassign@@QEAA at PEAVstreambuf@@@Z */
>>  DEFINE_THISCALL_WRAPPER(ostream_sb_ctor, 12)
> Calling ostream equivalents is OK in most cases. In case of constructors
> ostream_withassing_vtable should be used.
And how will that vtable be different from ostream_vtable? Should I add 
an ostream_withassign_vector_dtor too?