ARM VFP add encoding of the bitcount to fixed-point<-->floating point. insns.
ARM VFP add encoding of the bitcount to fixed-point<-->floating point. insns.

The value from the operands isn't right yet, but we weren't encoding it at
all previously. The parser needs to twiddle the values when building the
instruction.

Partial for: rdar://10558523

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@147170 91177308-0d34-0410-b5e6-96231b3b80d8

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