Revert "Revert "Introduce a number of MSA instructions for MIPS64""

This reverts commit 219bf253e5158c4f3438e70864b8bf7235c1e193.

Fixed memory leak in assembler_mips64_test.cc.

Test: mma valgrind-test-art-host-gtest-assembler_mips64_test64

Change-Id: I238833fd4555623c2716432fc67eab7696f1e28e
8 files changed