Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Fix disassembly of the invala, itc, itr and hint instructions
by fixing the opcode ordering.

MFC after: 1 week

Update to SDM 2.2:
o Add tf (test feature) instruction,
o Add vmsw (VM switch) instruction.

While here, update copyright.

MFC after: 1 week

Sync up with SDM 2.1:
o Add nop/hint formats F16, I18, M48 and X5,
o Add format M47 for ptc.e,
o Add hint instruction,
o Fix decoding of cmp8xchg16.

/* -> /*- for copyright notices, minor format tweaks as necessary

Remove two unused fields in the operand structure (o_read & o_write).

Add a new disassembler that improves over the previous disassembler
in that it provides an abstract (intermediate) representation for
instructions. This significantly improves working with instructions
such as emulation of instructions that are not implemented by the
hardware (e.g. long branch) or enhancing implemented instructions
(e.g. handling of misaligned memory accesses). Not to mention that
it's much easier to print instructions.

Functions are included that provide a textual representation for
opcodes, completers and operands.

The disassembler supports all ia64 instructions defined by revision
2.1 of the SDM (Oct 2002).