Revert of Remove SIMD.js from V8.

src/crankshaft/arm64/lithium-codegen-arm64.cc

Index: src/crankshaft/arm64/lithium-codegen-arm64.cc
diff --git a/src/crankshaft/arm64/lithium-codegen-arm64.cc b/src/crankshaft/arm64/lithium-codegen-arm64.cc
index 179d71ca9b4e8f3f7ebcd2ea007ebe66ece7a8b2..99b6fd51dc0a18577f92202271665fa03420f1db 100644
--- a/src/crankshaft/arm64/lithium-codegen-arm64.cc
+++ b/src/crankshaft/arm64/lithium-codegen-arm64.cc
@@ -1862,6 +1862,12 @@
       if (expected & ToBooleanHint::kSymbol) {
         // Symbol value -> true.
         __ CompareInstanceType(map, scratch, SYMBOL_TYPE);
+        __ B(eq, true_label);
+      }
+
+      if (expected & ToBooleanHint::kSimdValue) {
+        // SIMD value -> true.
+        __ CompareInstanceType(map, scratch, SIMD128_VALUE_TYPE);
         __ B(eq, true_label);
       }
 
@@ -5446,6 +5452,20 @@
     EmitTestAndBranch(instr, eq, scratch,
                       (1 << Map::kIsCallable) | (1 << Map::kIsUndetectable));
 
+// clang-format off
+#define SIMD128_TYPE(TYPE, Type, type, lane_count, lane_type)       \
+  } else if (String::Equals(type_name, factory->type##_string())) { \
+    DCHECK((instr->temp1() != NULL) && (instr->temp2() != NULL));   \
+    Register map = ToRegister(instr->temp1());                      \
+                                                                    \
+    __ JumpIfSmi(value, false_label);                               \
+    __ Ldr(map, FieldMemOperand(value, HeapObject::kMapOffset));    \
+    __ CompareRoot(map, Heap::k##Type##MapRootIndex);               \
+    EmitBranch(instr, eq);
+  SIMD128_TYPES(SIMD128_TYPE)
+#undef SIMD128_TYPE
+    // clang-format on
+
   } else {
     __ B(false_label);
   }