work around a gcc bug in order to properly align hal_float_t
work around a gcc bug in order to properly align hal_float_t

As discovered first by micges, gcc did not give 8-byte alignment
when hal_float_t was placed in unions or structures.  This
appears to be a gcc bug, which I have filed as
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42098

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