Add a kSimd128 machine type for Turbofan.

src/compiler/instruction.cc

Index: src/compiler/instruction.cc
diff --git a/src/compiler/instruction.cc b/src/compiler/instruction.cc
index d19764b1f71d9a4fdf8948c1e6b12a84f8726922..d4ec6bc9438318487c3fa0b60aa0bb4d122c003b 100644
--- a/src/compiler/instruction.cc
+++ b/src/compiler/instruction.cc
@@ -164,6 +164,9 @@ std::ostream& operator<<(std::ostream& os,
         case MachineRepresentation::kFloat64:
           os << "|f64";
           break;
+        case MachineRepresentation::kSimd128:
+          os << "|s128";
+          break;
         case MachineRepresentation::kTagged:
           os << "|t";
           break;
@@ -744,6 +747,7 @@ static MachineRepresentation FilterRepresentation(MachineRepresentation rep) {
     case MachineRepresentation::kWord64:
     case MachineRepresentation::kFloat32:
     case MachineRepresentation::kFloat64:
+    case MachineRepresentation::kSimd128:
     case MachineRepresentation::kTagged:
       return rep;
     case MachineRepresentation::kNone: