Revert of Remove SIMD.js from V8.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index bfe6fea38a54af774077bcdd47ea9282856845f1..6dc51341906768d32ad55285262e4edcc8b4604a 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -135,6 +135,16 @@
   V(Map, fixed_float32_array_map, FixedFloat32ArrayMap)                        \
   V(Map, fixed_float64_array_map, FixedFloat64ArrayMap)                        \
   V(Map, fixed_uint8_clamped_array_map, FixedUint8ClampedArrayMap)             \
+  V(Map, float32x4_map, Float32x4Map)                                          \
+  V(Map, int32x4_map, Int32x4Map)                                              \
+  V(Map, uint32x4_map, Uint32x4Map)                                            \
+  V(Map, bool32x4_map, Bool32x4Map)                                            \
+  V(Map, int16x8_map, Int16x8Map)                                              \
+  V(Map, uint16x8_map, Uint16x8Map)                                            \
+  V(Map, bool16x8_map, Bool16x8Map)                                            \
+  V(Map, int8x16_map, Int8x16Map)                                              \
+  V(Map, uint8x16_map, Uint8x16Map)                                            \
+  V(Map, bool8x16_map, Bool8x16Map)                                            \
   /* Canonical empty values */                                                 \
   V(ByteArray, empty_byte_array, EmptyByteArray)                               \
   V(FixedTypedArrayBase, empty_fixed_uint8_array, EmptyFixedUint8Array)        \
@@ -269,6 +279,16 @@
   V(MetaMap)                            \
   V(HeapNumberMap)                      \
   V(MutableHeapNumberMap)               \
+  V(Float32x4Map)                       \
+  V(Int32x4Map)                         \
+  V(Uint32x4Map)                        \
+  V(Bool32x4Map)                        \
+  V(Int16x8Map)                         \
+  V(Uint16x8Map)                        \
+  V(Bool16x8Map)                        \
+  V(Int8x16Map)                         \
+  V(Uint8x16Map)                        \
+  V(Bool8x16Map)                        \
   V(NativeContextMap)                   \
   V(FixedArrayMap)                      \
   V(CodeMap)                            \
@@ -1934,6 +1954,13 @@
   MUST_USE_RESULT AllocationResult AllocateHeapNumber(
       MutableMode mode = IMMUTABLE, PretenureFlag pretenure = NOT_TENURED);
 
+// Allocates SIMD values from the given lane values.
+#define SIMD_ALLOCATE_DECLARATION(TYPE, Type, type, lane_count, lane_type) \
+  AllocationResult Allocate##Type(lane_type lanes[lane_count],             \
+                                  PretenureFlag pretenure = NOT_TENURED);
+  SIMD128_TYPES(SIMD_ALLOCATE_DECLARATION)
+#undef SIMD_ALLOCATE_DECLARATION
+
   // Allocates a byte array of the specified length
   MUST_USE_RESULT AllocationResult
   AllocateByteArray(int length, PretenureFlag pretenure = NOT_TENURED);