[PATCH] x86: Revert patches to fix PR target/88794

[Wei Xiao]

The original runtime testcases are incorrect and I have fixed them as attached.
Is it ok to do the revert and fix the testcases for trunk?

Wei

2019-01-16  Wei Xiao  <wei3.xiao@intel.com>

        * gcc.target/i386/avx512f-vfixupimmpd-2.c: Fix the test cases for
        VFIXUPIMM* intrinsics.
        * gcc.target/i386/avx512f-vfixupimmps-2.c: Ditto.
        * gcc.target/i386/avx512f-vfixupimmsd-2.c: Ditto.
        * gcc.target/i386/avx512f-vfixupimmss-2.c: Ditto.
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