undefined ia64_double_zero in hs19

[Matthias Klose]

The hotspot build fails on ia64, ia64_double_zero is not defined anymore. The 
code references a "IA64 gcc bug", but I cannot find any open GCC report for this 
issue. Is this fixed upstream, or is the workaround still necessary? If it's the 
latter, please restore the ia64_double_zero definition.

   Matthias
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