x86-64 -mtls-dialect=gnu2 change needs to be postponed

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We've hit an ABI ambiguity/bug:

  gcc: -mtls-dialect=gnu2 produces wrong code on x86-64
  <https://bugzilla.redhat.com/show_bug.cgi?id=2263739>

Apart from that, support in the GNU toolchain seems to be quite good.
In particular, GDB handled the situation in the polymake crash quite
well (reporting TLS data as uninitialized for the thread before the
critical call, and producing the correct address for the variable
afterwards).

Thanks,
Florian
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