[WASM] Eliminate SIMD boolean vector types.

src/compiler/representation-change.cc

Index: src/compiler/representation-change.cc
diff --git a/src/compiler/representation-change.cc b/src/compiler/representation-change.cc
index 68261c69d3ca6a47f872c9ce8eed0d70f89c0241..eee75bdd6f4f042c7ba927496555da5c980e2927 100644
--- a/src/compiler/representation-change.cc
+++ b/src/compiler/representation-change.cc
@@ -194,9 +194,6 @@ Node* RepresentationChanger::GetRepresentationFor(
       DCHECK(use_info.type_check() == TypeCheckKind::kNone);
       return GetWord64RepresentationFor(node, output_rep, output_type);
     case MachineRepresentation::kSimd128:
-    case MachineRepresentation::kSimd1x4:
-    case MachineRepresentation::kSimd1x8:
-    case MachineRepresentation::kSimd1x16:
     case MachineRepresentation::kNone:
       return node;
   }