Emit VMLA for multiply-add on ARM

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index a874a2400aa1a850eb924ceb83c0df8f02b03519..0c6aaea05d5e247a31a51d611401bd631bae40e0 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -1281,6 +1281,12 @@ LInstruction* LChunkBuilder::DoMul(HMul* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoMultiplyAdd(HMultiplyAdd* instr) {
+  UNIMPLEMENTED();
+  return NULL;
+}
+
+
 LInstruction* LChunkBuilder::DoSub(HSub* instr) {
   if (instr->representation().IsInteger32()) {
     ASSERT(instr->left()->representation().IsInteger32());