MFC: r204974, r205002

MFC: r204974, r205002

- The OPSZ macro actually only does the right thing for int32 and int64
  operands but not for double and extended double ones. Instead of trying
  to fix the macro just nuke it and unroll the loops in the correct way
  though as extended double operands turn out to be the only special case.
- For FxTO{s,d,q} the source operand is int64 so rs2 has to be re-decoded
  after setting type accordingly as it's generally decoded using the low
  2 bits as the type, which are 0 for these three instructions.
- Similarly, in case of F{s,d,q}TOx the target is int64 so rd has to be
  re-decoded using not only the operand mask appropriate for int64 but
  also the correct register number encoding.
- Use const where appropriate.
- Wrap long lines.

Submitted by:	Peter Jeremy (partly)

git-svn-id: svn://svn.freebsd.org/base/stable/8@205183 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f