[PATCH] Give libcxx tests temporary filenames that are actually unique.

[Jon Roelofs]

Hi danalbert,

With newlib as the libc, the following program would print out the same filename twice:

```
#include "support/platform_support.h"
#include <iostream>
int main() {
std::string temp1 = get_temp_file_name();
std::string temp2 = get_temp_file_name();
std::cout << temp1 << " " << temp2 << std::endl;
}
```

This breaks a few of the tests similar to input.output/file.streams/fstreams/filebuf.assign/member_swap.pass.cpp which expect the returned filenames to be different.

This patch fixes that bug by creating a TempFileName class which, on construction, is guaranteed to have a unique name.

Please double check the Windows side of the TempFileName class with extra scrutiny. I have neither tested, nor built this on Windows (and I don't have a machine to try it out on either).

http://reviews.llvm.org/D4962

Files:
  test/input.output/file.streams/fstreams/filebuf.assign/member_swap.pass.cpp
  test/input.output/file.streams/fstreams/filebuf.assign/move_assign.pass.cpp
  test/input.output/file.streams/fstreams/filebuf.assign/nonmember_swap.pass.cpp
  test/input.output/file.streams/fstreams/filebuf.cons/move.pass.cpp
  test/input.output/file.streams/fstreams/filebuf.members/open_pointer.pass.cpp
  test/input.output/file.streams/fstreams/fstream.assign/member_swap.pass.cpp
  test/input.output/file.streams/fstreams/fstream.assign/move_assign.pass.cpp
  test/input.output/file.streams/fstreams/fstream.assign/nonmember_swap.pass.cpp
  test/input.output/file.streams/fstreams/fstream.cons/move.pass.cpp
  test/input.output/file.streams/fstreams/fstream.cons/pointer.pass.cpp
  test/input.output/file.streams/fstreams/fstream.cons/string.pass.cpp
  test/input.output/file.streams/fstreams/fstream.members/close.pass.cpp
  test/input.output/file.streams/fstreams/fstream.members/open_pointer.pass.cpp
  test/input.output/file.streams/fstreams/fstream.members/open_string.pass.cpp
  test/input.output/file.streams/fstreams/ofstream.assign/member_swap.pass.cpp
  test/input.output/file.streams/fstreams/ofstream.assign/move_assign.pass.cpp
  test/input.output/file.streams/fstreams/ofstream.assign/nonmember_swap.pass.cpp
  test/input.output/file.streams/fstreams/ofstream.cons/move.pass.cpp
  test/input.output/file.streams/fstreams/ofstream.cons/pointer.pass.cpp
  test/input.output/file.streams/fstreams/ofstream.cons/string.pass.cpp
  test/input.output/file.streams/fstreams/ofstream.members/close.pass.cpp
  test/input.output/file.streams/fstreams/ofstream.members/open_pointer.pass.cpp
  test/input.output/file.streams/fstreams/ofstream.members/open_string.pass.cpp
  test/input.output/file.streams/fstreams/ofstream.members/rdbuf.pass.cpp
  test/support/platform_support.h
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