[WASM] Eliminate SIMD boolean vector types.

src/compiler/register-allocator.cc

Index: src/compiler/register-allocator.cc
diff --git a/src/compiler/register-allocator.cc b/src/compiler/register-allocator.cc
index b15fbb092e57315b91ecf2d7bf626080358497de..f5d43761d20f0c19ae16e00d6aafc5db0b8cf74b 100644
--- a/src/compiler/register-allocator.cc
+++ b/src/compiler/register-allocator.cc
@@ -88,10 +88,6 @@ int GetByteWidth(MachineRepresentation rep) {
       return kDoubleSize;
     case MachineRepresentation::kSimd128:
       return kSimd128Size;
-    case MachineRepresentation::kSimd1x4:
-    case MachineRepresentation::kSimd1x8:
-    case MachineRepresentation::kSimd1x16:
-      return kSimdMaskRegisters ? kPointerSize : kSimd128Size;
     case MachineRepresentation::kNone:
       break;
   }