MIPS: Add maddv/msubv MSA instructions

Added maddv.df, msubv.df, fmadd.df and fmsub.df MSA instructions
in assembler, disassembler and tests.

These instructions are needed for multiplyaccumulate support in
ART Vectorizer.

Test: mma test-art-host-gtest

Change-Id: Idef7faaeed47f1fef83fa58676ce664afe24ffe8
diff --git a/disassembler/disassembler_mips.cc b/disassembler/disassembler_mips.cc
index 7cb216e..1a395a4 100644
--- a/disassembler/disassembler_mips.cc
+++ b/disassembler/disassembler_mips.cc
@@ -477,6 +477,10 @@
   { kMsaSpecialMask | (0xf << 2), kMsa | (0x8 << 2), "ld", "kw" },
   { kMsaSpecialMask | (0xf << 2), kMsa | (0x9 << 2), "st", "kw" },
   { kMsaMask | (0x7 << 23), kMsa | (0x5 << 23) | 0x14, "ilvr", "Vkmn" },
+  { kMsaMask | (0x7 << 23), kMsa | (0x1 << 23) | 0x12, "maddv", "Vkmn" },
+  { kMsaMask | (0x7 << 23), kMsa | (0x2 << 23) | 0x12, "msubv", "Vkmn" },
+  { kMsaMask | (0xf << 22), kMsa | (0x4 << 22) | 0x1b, "fmadd", "Ukmn" },
+  { kMsaMask | (0xf << 22), kMsa | (0x5 << 22) | 0x1b, "fmsub", "Ukmn" },
 };
 
 static uint32_t ReadU32(const uint8_t* ptr) {