cmd/objdump: fix disassembly suffixes

    MOVB $1, (AX) was being disassembled as MOVL $1, (AX).

    Use the memory size to override the standard size.
    Fix the tests.

Change-Id: Ieac10cc8f6ec443c8bb45a370681f7b7cf4b92cb
Reviewed-on: https://go-review.googlesource.com/23607
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2 files changed