ARM64: Support MultiplyAccumulate for SIMD.

Test: test-art-host, test-art-target.

Change-Id: I06af8415e15352d09d176cae828163cbe99ae7a7
diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index 6be237e..af953c8 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -1382,6 +1382,7 @@
   M(VecShl, VecBinaryOperation)                                         \
   M(VecShr, VecBinaryOperation)                                         \
   M(VecUShr, VecBinaryOperation)                                        \
+  M(VecMultiplyAccumulate, VecOperation)                                \
   M(VecLoad, VecMemoryOperation)                                        \
   M(VecStore, VecMemoryOperation)                                       \