* mips-tdep.c (mips_o32_push_dummy_call): Take account of

* mips-tdep.c (mips_o32_push_dummy_call): Take account of
argument alignment requirements when calculating stack space
required.  When aligning an arg register to eight bytes
boundary, align stack_offset too.  Write floating-point
arguments to the appropriate integer register if need go there.
(mips_o64_push_dummy_call): Likewise.