Add hack to fix tests building with older GCC
Add hack to fix tests building with older GCC

RHEL6 PPC GCC 4.4 is optimizing the function,
and generating a subtley altered NanD64 with
a zeroed payload. Explicitly placing the value
into memory seems to prevent this transformation.

Signed-off-by: Paul E. Murphy <bcb79dc2d3103f301c432ff2685f8b89fad82826@linux.vnet.ibm.com>

gftg85/libdfp,gftg85/libdfp,gftg85/libdfp,gftg85/libdfp