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

src/compiler/simplified-lowering.cc

Index: src/compiler/simplified-lowering.cc
diff --git a/src/compiler/simplified-lowering.cc b/src/compiler/simplified-lowering.cc
index 715e4189b6298f8eedce5cf73ffc267b4e8a2b89..851005b69775a07a2bf13717ed9025240af8fa90 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -138,7 +138,10 @@ UseInfo TruncatingUseInfoFromRepresentation(MachineRepresentation rep) {
       return UseInfo::TruncatingWord32();
     case MachineRepresentation::kBit:
       return UseInfo::Bool();
-    case MachineRepresentation::kSimd128:  // Fall through.
+    case MachineRepresentation::kSimd128:
+    case MachineRepresentation::kSimdBool4:
+    case MachineRepresentation::kSimdBool8:
+    case MachineRepresentation::kSimdBool16:
     case MachineRepresentation::kNone:
       break;
   }