Add a kSimd128 machine type for Turbofan.

src/compiler/mips64/instruction-selector-mips64.cc

Index: src/compiler/mips64/instruction-selector-mips64.cc
diff --git a/src/compiler/mips64/instruction-selector-mips64.cc b/src/compiler/mips64/instruction-selector-mips64.cc
index c539600506d9ec1aed30eabb4b941c14681806ee..6ec8abac45116e6b1b7ee18a8895d9a5660f05a3 100644
--- a/src/compiler/mips64/instruction-selector-mips64.cc
+++ b/src/compiler/mips64/instruction-selector-mips64.cc
@@ -159,6 +159,7 @@ void InstructionSelector::VisitLoad(Node* node) {
     case MachineRepresentation::kWord64:
       opcode = kMips64Ld;
       break;
+    case MachineRepresentation::kSimd128:  // Fall through.
     case MachineRepresentation::kNone:
       UNREACHABLE();
       return;
@@ -241,6 +242,7 @@ void InstructionSelector::VisitStore(Node* node) {
       case MachineRepresentation::kWord64:
         opcode = kMips64Sd;
         break;
+      case MachineRepresentation::kSimd128:  // Fall through.
       case MachineRepresentation::kNone:
         UNREACHABLE();
         return;
@@ -1341,6 +1343,7 @@ void InstructionSelector::VisitCheckedLoad(Node* node) {
       break;
     case MachineRepresentation::kBit:
     case MachineRepresentation::kTagged:
+    case MachineRepresentation::kSimd128:
     case MachineRepresentation::kNone:
       UNREACHABLE();
       return;
@@ -1390,6 +1393,7 @@ void InstructionSelector::VisitCheckedStore(Node* node) {
       break;
     case MachineRepresentation::kBit:
     case MachineRepresentation::kTagged:
+    case MachineRepresentation::kSimd128:
     case MachineRepresentation::kNone:
       UNREACHABLE();
       return;