assemble: defer MERR_OPSIZEMISSING
assemble: defer MERR_OPSIZEMISSING

In order for the machinery that deduces memory operand sizes when they
are not provided to work correctly, we need to make sure that
MERR_OPSIZEMISSING is only issued by matches() as the last resort;
that way all other error conditions will have been filtered out and we
know at the very end if we have exactly one option left.

This is a partial revert of cd26fccab48bc35465e68d44a7432d1b1cca4d7e,
but does not affect the functionality introduced by that patch.

Reported-by: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@gmail.com>
Signed-off-by: H. Peter Anvin (Intel) <8a453bad9912ffe59bc0f0b8abe03df9be19379e@zytor.com>

techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm