Remove Hack in compiler/nativeGen/X86/CodeGen.hs

Remove the hack around Line 3914 labeled with:

    -- HACK: On x86_64 binutils<2.17 is only able to generate PC32
    -- relocations, hence we only get 32-bit offsets in the jump
    -- table. As these offsets are always negative we need to properly
    -- sign extend them to 64-bit. This hack should be removed in
    -- conjunction with the hack in PprMach.hs/pprDataItem once
    -- binutils 2.17 is standard.

This bug is intended for house keeping.

Edited Mar 10, 2019 by rwbarton

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