Remove test while I investigate why the test is breaking the bots.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209558 91177308-0d34-0410-b5e6-96231b3b80d8

test/Headers/xmmintrin.c

-// RUN: %clang_cc1 %s -triple x86_64-apple-macosx10.9.0 -emit-llvm -o - | FileCheck %s
-// XFAIL: *
-
-#include <xmmintrin.h>
-
-// Make sure the last step of _mm_cvtps_pi16 converts <4 x i32> to <4 x i16> by
-// checking that clang emits PACKSSDW instead of PACKSSWB.
-
-// CHECK: define i64 @test_mm_cvtps_pi16
-// CHECK: call x86_mmx @llvm.x86.mmx.packssdw
-
-__m64 test_mm_cvtps_pi16(__m128 a) {
-  return _mm_cvtps_pi16(a);
-}