[WASM] Eliminate SIMD boolean vector types.

src/compiler/simd-scalar-lowering.h

Index: src/compiler/simd-scalar-lowering.h
diff --git a/src/compiler/simd-scalar-lowering.h b/src/compiler/simd-scalar-lowering.h
index 09c78dc983e3418b947d40a3d2a61bf7c8bb8f67..b4f7a8f0d671803bccbaf38b37f5e2557af4427e 100644
--- a/src/compiler/simd-scalar-lowering.h
+++ b/src/compiler/simd-scalar-lowering.h
@@ -28,15 +28,7 @@ class SimdScalarLowering {
  private:
   enum class State : uint8_t { kUnvisited, kOnStack, kVisited };
 
-  enum class SimdType : uint8_t {
-    kFloat32x4,
-    kInt32x4,
-    kInt16x8,
-    kInt8x16,
-    kSimd1x4,
-    kSimd1x8,
-    kSimd1x16
-  };
+  enum class SimdType : uint8_t { kFloat32x4, kInt32x4, kInt16x8, kInt8x16 };
 
 #if defined(V8_TARGET_BIG_ENDIAN)
   static constexpr int kLaneOffsets[16] = {15, 14, 13, 12, 11, 10, 9, 8,