Revert of Remove SIMD.js from V8.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index c7f6ae0f283a511b5adbd77a2fddb3cac30bdd9b..669c3fbfa3f9eef618ae0582c7f1451556324b8c 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -66,6 +66,16 @@
   V(TransitionElementsKind)                   \
   /* --- TurboFanCodeStubs --- */             \
   V(AllocateHeapNumber)                       \
+  V(AllocateFloat32x4)                        \
+  V(AllocateInt32x4)                          \
+  V(AllocateUint32x4)                         \
+  V(AllocateBool32x4)                         \
+  V(AllocateInt16x8)                          \
+  V(AllocateUint16x8)                         \
+  V(AllocateBool16x8)                         \
+  V(AllocateInt8x16)                          \
+  V(AllocateUint8x16)                         \
+  V(AllocateBool8x16)                         \
   V(ArrayNoArgumentConstructor)               \
   V(ArraySingleArgumentConstructor)           \
   V(ArrayNArgumentsConstructor)               \
@@ -1558,6 +1568,21 @@
   DEFINE_TURBOFAN_CODE_STUB(AllocateHeapNumber, TurboFanCodeStub);
 };
 
+#define SIMD128_ALLOC_STUB(TYPE, Type, type, lane_count, lane_type)            \
+  class Allocate##Type##Stub : public TurboFanCodeStub {                       \
+   public:                                                                     \
+    explicit Allocate##Type##Stub(Isolate* isolate)                            \
+        : TurboFanCodeStub(isolate) {}                                         \
+                                                                               \
+    void InitializeDescriptor(CodeStubDescriptor* descriptor) override;        \
+    void GenerateAssembly(compiler::CodeAssemblerState* state) const override; \
+                                                                               \
+    DEFINE_CALL_INTERFACE_DESCRIPTOR(Allocate##Type);                          \
+    DEFINE_CODE_STUB(Allocate##Type, TurboFanCodeStub);                        \
+  };
+SIMD128_TYPES(SIMD128_ALLOC_STUB)
+#undef SIMD128_ALLOC_STUB
+
 class CommonArrayConstructorStub : public TurboFanCodeStub {
  protected:
   CommonArrayConstructorStub(Isolate* isolate, ElementsKind kind,
@@ -1729,7 +1754,7 @@
   ToBooleanICStub(Isolate* isolate, InitializationState init_state)
       : HydrogenCodeStub(isolate, init_state) {}
 
-  static const int kNumHints = 8;
+  static const int kNumHints = 9;
   STATIC_ASSERT(static_cast<int>(ToBooleanHint::kAny) ==
                 ((1 << kNumHints) - 1));
   class HintsBits : public BitField<uint16_t, 0, kNumHints> {};