[PATCH][CMake] Add target to generate td file with all records

[Adam Nemet]

This is the cmake version of r208056 that was requested by James Molloy.  For
now I only added X86 for the sake of the review.  I'll add the rest as obvious
later.

This is the closest I could get to the make version.  I didn't want
td.expanded to be generate by default, so I added a new target for it.  Looks
like that there is no way to simply have the file name match the rule with
add_custom_target as in make (you'd need add_executable or add_library for
that).

Please let me know if this looks good.

Thanks,
Adam

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