vchoi_fork

[svn-r1103] Purpose:
    Bug fix

Problem:
    This bug is coming up as a bus error on some machines
    (fuga, spank) in the "fillval" test.  At higher levels of
    optimizations, H5detect gets rid of a statement which is to
    be used in alignment tests.  Because of this, SIGBUS is never
    delivered, and the alignment constraints of the machine are
    not recorded correctly by H5detect in H5Tinit.c.

Solution:
    By preventing the optimizer from getting rid of the statement
    to be used in the alignment tests, SIGBUS is delivered as
    expected, and the alignment constraints of the machine are
    recorded correctly.

Platform tested:
    Irix6.5(fuga), HPUX10.20(spank), Solaris2.5(Kryten)