[RFA] mips 32/64 register/stack fix

[Andrew Cagney]

> #0  register_size (gdbarch=0x84093e8, regnum=120)

120 looks large enough to be cooked (but to confirm this can you look at 
"maint print raw-registers".  This will also tell us the register's 
type, and hence confirm the size.

Given that you see 8, this suggests that the register's type is wrong 
(see mips_register_type).

Also, what information is available in the object file header?

Andrew