MIPS64: Add min/max MSA instructions

Added min_s.df, max_s.df, min_u.df, max_u.df, fmin.df and fmax.df MSA
instructions in assembler, disassembler and tests.

These instructions are needed for min/max support in ART Vectorizer.

Test: mma test-art-host-gtest
Change-Id: I4e8dd18ca501ac09d938a49388e4a43116660ec9
4 files changed