ART: Add support for constant vector literals

Add in some vector instructions.  Implement the ConstVector
instruction, which takes 4 words of data and loads it into
an XMM register.

Initially, only the ConstVector MIR opcode is implemented. Others will
be added after this one goes in.

Change-Id: I5c79bc8b7de9030ef1c213fc8b227debc47f6337
Signed-off-by: Mark Mendell <mark.p.mendell@intel.com>
10 files changed