MIPS64: Add MSA instruction set feature option

MSA (MIPS SIMD Architecture) is SIMD extension which will be used
for ART Vectorizer implementation on MIPS64.

Test: mma test-art-target in QEMU
Test: mma test-art-host-gtest

Change-Id: Ib8cdbac78f7d91c2929bfe5cc29c8795fee26358
3 files changed