Add AVX support for packed add/sub instructions on x86

Test: ./test.py --host, test-art-host-gtest

Change-Id: I48d05e6f6befd54657d962119a543b27a8a51d71
Signed-off-by: Shalini Salomi Bodapati <shalini.salomi.bodapati@intel.com>
11 files changed