[Issue 2617] asm silently accepts ambiguous-sized operations

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=2617

--- Comment #8 from Walter Bright <bugzilla at digitalmars.com> ---
Looking at my ancient Intel 8088 manual, it says:

    INC [BX]

is ambiguous and so must use BYTE PTR or WORD PTR. Since the behavior of iasm
is modeled after Intel's syntax, that pretty much settles it.

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