Revert of Remove SIMD.js from V8.

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

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/arm64/lithium-codegen-arm64.h"
 
 #include "src/arm64/frames-arm64.h"
 #include "src/base/bits.h"
 #include "src/builtins/builtins-constructor.h"
 #include "src/code-factory.h"
@@ skipping 1847 matching lines @@
         __ B(true_label);
         __ Bind(&not_string);
       }
 
       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);
+      }
+
       if (expected & ToBooleanHint::kHeapNumber) {
         Label not_heap_number;
         __ JumpIfNotRoot(map, Heap::kHeapNumberMapRootIndex, &not_heap_number);
 
         __ Ldr(double_scratch(),
                FieldMemOperand(value, HeapNumber::kValueOffset));
         __ Fcmp(double_scratch(), 0.0);
         // If we got a NaN (overflow bit is set), jump to the false branch.
         __ B(vs, false_label);
         __ B(eq, false_label);
@@ skipping 3561 matching lines @@
     __ JumpIfSmi(value, false_label);
     __ JumpIfRoot(value, Heap::kNullValueRootIndex, true_label);
     STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
     __ JumpIfObjectType(value, map, scratch, FIRST_JS_RECEIVER_TYPE,
                         false_label, lt);
     // Check for callable or undetectable objects => false.
     __ Ldrb(scratch, FieldMemOperand(map, Map::kBitFieldOffset));
     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);
   }
 }
 
 
 void LCodeGen::DoUint32ToDouble(LUint32ToDouble* instr) {
   __ Ucvtf(ToDoubleRegister(instr->result()), ToRegister32(instr->value()));
 }
 
@@ skipping 125 matching lines @@
   // Index is equal to negated out of object property index plus 1.
   __ Sub(result, result, Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ Ldr(result, FieldMemOperand(result,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ Bind(deferred->exit());
   __ Bind(&done);
 }
 
 }  // namespace internal
 }  // namespace v8