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

src/compiler/instruction-selector.h

Index: src/compiler/instruction-selector.h
diff --git a/src/compiler/instruction-selector.h b/src/compiler/instruction-selector.h
index dab2c0f70a40506975e7bb934441ea1ff757469f..d811aa474198c893e36970f5c80fd449db82a913 100644
--- a/src/compiler/instruction-selector.h
+++ b/src/compiler/instruction-selector.h
@@ -263,6 +263,27 @@ class V8_EXPORT_PRIVATE InstructionSelector final {
   void MarkAsSimd128(Node* node) {
     MarkAsRepresentation(MachineRepresentation::kSimd128, node);
   }
+  void MarkAsSimd1x4(Node* node) {
+    if (kSimdMaskRegisters) {
+      MarkAsRepresentation(MachineRepresentation::kSimd1x4, node);
+    } else {
+      MarkAsSimd128(node);
+    }
+  }
+  void MarkAsSimd1x8(Node* node) {
+    if (kSimdMaskRegisters) {
+      MarkAsRepresentation(MachineRepresentation::kSimd1x8, node);
+    } else {
+      MarkAsSimd128(node);
+    }
+  }
+  void MarkAsSimd1x16(Node* node) {
+    if (kSimdMaskRegisters) {
+      MarkAsRepresentation(MachineRepresentation::kSimd1x16, node);
+    } else {
+      MarkAsSimd128(node);
+    }
+  }
   void MarkAsReference(Node* node) {
     MarkAsRepresentation(MachineRepresentation::kTagged, node);
   }