[PATCH] Not throw away (M) mode for vector multipy instruction in bfin gas

[Jie Zhang]

Previously, if the MAC1 operation comes as the second operand in a
vector Multiply 16-Bit Operands instruction and has (M) mode flag, the
(M) mode flag was thown away by gas. This patch fixes it. I also add
more check conditions for both vector
and scalar Multiply 16-Bit Operands instructions in this patch. It
will result better diagnositic information for users. It also adds
some bits in bfin gas regression testsuite for this bug. Committed.

Jie
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