[PATCH 4.5]: Fix PR39146 unneccesary stack realign

[Ye, Joey]

Refer to http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39146

gcc/ChangeLog:
2009-03-01  Joey Ye  <joey.ye@intel.com>

        PR middle-end/39146
        * cfgexpand.c (get_decl_align_unit): Update
        max_used_stack_slot_alignment with align instead of
        stack_alignment_needed.

        * function.c (assign_stack_local_1): Update
        max_used_stack_slot_alignment with alignment_in_bits instead
        of stack_alignment_needed.
        (locate_and_pad_parm): Don't update max_used_stack_slot_alignment
        here.

Modified:
    branches/stack/gcc/cfgexpand.c
    branches/stack/gcc/function.c

testsuites/ChangeLog:
2009-03-01  H.J. Lu  <hongjiu.lu@intel.com>

     * gcc.target/i386/avx-m256-align.c: New testcase.

Thanks - Joey 
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