Stack offsets are wrong for MIPS

[romits800]

    %sp = ADDiu %sp, -12
    ...
    SW %s5, %sp, -1
    %at = OR %t0, %zero
    %gp = OR %a0, %zero
    SW %s3, %sp, -12
    SDC1 %d12, %sp, -8

stack_issue.tar.gz