i386 backend: i386:r-word-mem-add immediate size specifier in name

[Danny Milosavljevic]

Hi Janneke,

are you sure about the following?

(define (i386:r-word-mem-add info v)
  (let ((r (get-r info)))
    `((,(string-append "addw___$i8,(%" r ")") (#:immediate2 ,v)))))
                               ^^^                        ^

DEFINE addw___$i8,(%eax) 668100
DEFINE addw___$i8,(%ebx) 668103

Compare:

(define (i386:r-byte-mem-add info v)
  (let ((r (get-r info)))
    `((,(string-append "addb___$i8,(%" r ")") (#:immediate1 ,v)))))

DEFINE addb___$i8,(%eax) 8000
DEFINE addb___$i8,(%ebx) 8003

I guess it doesn't matter much what the M1 macro is called, but for consistency 
I suggest $i16 for the addw.

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