[V8] Implement SIMD Boolean vector types to allow mask registers.

src/compiler/instruction.cc

Index: src/compiler/instruction.cc
diff --git a/src/compiler/instruction.cc b/src/compiler/instruction.cc
index 90d9bb46910b814e4ec121b7754cb0c8fa527298..ded2bd2679e5dd598f01013dcf3683f07ac467a1 100644
--- a/src/compiler/instruction.cc
+++ b/src/compiler/instruction.cc
@@ -208,6 +208,15 @@ std::ostream& operator<<(std::ostream& os,
         case MachineRepresentation::kSimd128:
           os << "|s128";
           break;
+        case MachineRepresentation::kSimdBool4:
+          os << "|s1x4";
+          break;
+        case MachineRepresentation::kSimdBool8:
+          os << "|s1x8";
+          break;
+        case MachineRepresentation::kSimdBool16:
+          os << "|s1x16";
+          break;
         case MachineRepresentation::kTaggedSigned:
           os << "|ts";
           break;
@@ -888,6 +897,9 @@ static MachineRepresentation FilterRepresentation(MachineRepresentation rep) {
     case MachineRepresentation::kFloat32:
     case MachineRepresentation::kFloat64:
     case MachineRepresentation::kSimd128:
+    case MachineRepresentation::kSimdBool4:
+    case MachineRepresentation::kSimdBool8:
+    case MachineRepresentation::kSimdBool16:
     case MachineRepresentation::kTaggedSigned:
     case MachineRepresentation::kTaggedPointer:
     case MachineRepresentation::kTagged: