vchoi_fork

[svn-r9987] Purpose:  bug fix

Description:  For hardware conversion from integers to "long double" on AMD machine, the test
failed because the size of "long double"(can be 16 bytes) is bigger than the precision(80 bits).
There can be some garbage in the unused bytes in "long double".  That caused failure during
byte comparison.

Solution:  Clean these unused bytes before comparison.

Platforms tested:  mir and fuss; simple change