Convert between tagged and untagged kSimd128 values.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 32572e42952c7fb804ac5670b91afb69898ac7b4..4d1cad6b6d25abfe7835d6d638fe935b056b4182 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -1816,6 +1816,18 @@ Type* Typer::Visitor::TypeChangeFloat64ToTagged(Node* node) {
   return ChangeRepresentation(arg, Type::Tagged(), zone());
 }
 
+#define SIMD128_CHANGE(TYPE, SType, type, lane_count, lane_type)       \
+  Type* Typer::Visitor::TypeChangeTaggedTo##SType(Node* node) {        \
+    Type* arg = Operand(node, 0);                                      \
+    return ChangeRepresentation(arg, Type::UntaggedSimd128(), zone()); \
+  }                                                                    \
+                                                                       \
+  Type* Typer::Visitor::TypeChange##SType##ToTagged(Node* node) {      \
+    Type* arg = Operand(node, 0);                                      \
+    return ChangeRepresentation(arg, Type::Tagged(), zone());          \
+  }
+SIMD128_TYPES(SIMD128_CHANGE)
+#undef SIMD128_CHANGE
 
 Type* Typer::Visitor::TypeChangeBoolToBit(Node* node) {
   Type* arg = Operand(node, 0);