[simd] Introduce SIMD types (as classes)

src/types.h

Index: src/types.h
diff --git a/src/types.h b/src/types.h
index 31ee95cbb46069b21cf7e0764bebc21c9c74459d..66f209c12b7c09ec0af209dfabe3e9b827bfe21f 100644
--- a/src/types.h
+++ b/src/types.h
@@ -207,8 +207,8 @@ namespace internal {
   V(Symbol,              1u << 12 | REPRESENTATION(kTaggedPointer)) \
   V(InternalizedString,  1u << 13 | REPRESENTATION(kTaggedPointer)) \
   V(OtherString,         1u << 14 | REPRESENTATION(kTaggedPointer)) \
-  V(Undetectable,        1u << 15 | REPRESENTATION(kTaggedPointer)) \
-  /* Unused semantic bit 1u << 16 in case you are looking for a bit. */ \
+  V(Simd,                1u << 15 | REPRESENTATION(kTaggedPointer)) \
+  V(Undetectable,        1u << 16 | REPRESENTATION(kTaggedPointer)) \
   V(OtherObject,         1u << 17 | REPRESENTATION(kTaggedPointer)) \
   V(Proxy,               1u << 18 | REPRESENTATION(kTaggedPointer)) \
   V(Internal,            1u << 19 | REPRESENTATION(kTagged | kUntagged)) \
@@ -231,7 +231,7 @@ namespace internal {
   V(NumberOrString,      kNumber | kString) \
   V(NumberOrUndefined,   kNumber | kUndefined) \
   V(PlainPrimitive,      kNumberOrString | kBoolean | kNullOrUndefined) \
-  V(Primitive,           kSymbol | kPlainPrimitive) \
+  V(Primitive,           kSymbol | kSimd | kPlainPrimitive) \
   V(DetectableReceiver,  kOtherObject | kProxy) \
   V(Detectable,          kDetectableReceiver | kNumber | kName) \
   V(Object,              kOtherObject | kUndetectable) \
@@ -277,6 +277,7 @@ namespace internal {
 //   typedef Range;
 //   typedef Region;
 //   template<class> struct Handle { typedef type; }  // No template typedefs...
+//
 //   template<class T> static Handle<T>::type null_handle();
 //   template<class T> static Handle<T>::type handle(T* t);  // !is_bitset(t)
 //   template<class T> static Handle<T>::type cast(Handle<Type>::type);
@@ -423,6 +424,11 @@ class TypeImpl : public Config::Base {
     return function;
   }
 
+#define CONSTRUCT_SIMD_TYPE(NAME, Name, name, lane_count, lane_type) \
+  static TypeHandle Name(Isolate* isolate, Region* region);
+  SIMD128_TYPES(CONSTRUCT_SIMD_TYPE)
+#undef CONSTRUCT_SIMD_TYPE
+
   static TypeHandle Union(TypeHandle type1, TypeHandle type2, Region* reg);
   static TypeHandle Intersect(TypeHandle type1, TypeHandle type2, Region* reg);
   static TypeImpl* Union(TypeImpl* type1, TypeImpl* type2) {