Small patch for x86_64 to version 4.4

[Christoph Hellwig]

> +#if defined(CONFIG_X86) && !defined(CONFIG_X86_64)
>  /* According to Steve Lord, this code is ix86 specific.  Patches to extend it to
>   * other architectures will be greatefully accepted.
>   */

This ifdef (and comment) don't make sense.  The code won't even copile
on i386 when CONFIG_DISCONTIGMEM is set.  It should test !CONFIG_DISCONTIGMEM
and maybe !CONFIG_VIRTUAL_MEM_MAP for some strange ia64 thingy.
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