[PATCH] [COMPILER-RT] Implement __fixtfsi, __fixunstfsi

[GuanHong Liu]

OK, but the following two cases in the test will fail if there's no saturation logic in fixunstfsi. I think it's better to remove them, thanks.

  if (test__fixunstfsi(0x1.23456789abcdefp+40, UINT32_C(0xffffffff)))
      return 1;
  if (test__fixunstfsi(0x1.23456789abcdefp+256, UINT32_C(0xffffffff)))
      return 1;


http://reviews.llvm.org/D2804

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