Revert of Remove SIMD.js from V8.

src/full-codegen/arm/full-codegen-arm.cc

Index: src/full-codegen/arm/full-codegen-arm.cc
diff --git a/src/full-codegen/arm/full-codegen-arm.cc b/src/full-codegen/arm/full-codegen-arm.cc
index 4277ae0bdb393c795bc94c5d5e98c5eac4ca39ef..3a46c33aa5343fe475c35df40f0cad20bbcb6d48 100644
--- a/src/full-codegen/arm/full-codegen-arm.cc
+++ b/src/full-codegen/arm/full-codegen-arm.cc
@@ -2608,6 +2608,16 @@
     __ ldrb(r1, FieldMemOperand(r0, Map::kBitFieldOffset));
     __ tst(r1, Operand((1 << Map::kIsCallable) | (1 << Map::kIsUndetectable)));
     Split(eq, if_true, if_false, fall_through);
+// clang-format off
+#define SIMD128_TYPE(TYPE, Type, type, lane_count, lane_type)   \
+  } else if (String::Equals(check, factory->type##_string())) { \
+    __ JumpIfSmi(r0, if_false);                                 \
+    __ ldr(r0, FieldMemOperand(r0, HeapObject::kMapOffset));    \
+    __ CompareRoot(r0, Heap::k##Type##MapRootIndex);            \
+    Split(eq, if_true, if_false, fall_through);
+  SIMD128_TYPES(SIMD128_TYPE)
+#undef SIMD128_TYPE
+    // clang-format on
   } else {
     if (if_false != fall_through) __ jmp(if_false);
   }