[Issue 2617] asm silently accepts ambiguous-sized operations

[d-bugmail at puremagic.com]

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

--- Comment #6 from Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> ---
(In reply to Walter Bright from comment #5)
> As for the first instruction, I'm concerned about changing the behavior.
> Messing with people's existing, working asm code is risky.

See issue 7388. The problem is that if you copy/paste code from another
program, you'll get a different result. It probably should be deprecated,
forcing users to explicitly specify the operand size.

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