Revert of Remove SIMD.js from V8.

src/crankshaft/x64/lithium-codegen-x64.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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/crankshaft/x64/lithium-codegen-x64.h"
 
 #include "src/base/bits.h"
 #include "src/builtins/builtins-constructor.h"
@@ skipping 2047 matching lines @@
         __ jmp(instr->FalseLabel(chunk_));
         __ bind(&not_string);
       }
 
       if (expected & ToBooleanHint::kSymbol) {
         // Symbol value -> true.
         __ CmpInstanceType(map, SYMBOL_TYPE);
         __ j(equal, instr->TrueLabel(chunk_));
       }
 
+      if (expected & ToBooleanHint::kSimdValue) {
+        // SIMD value -> true.
+        __ CmpInstanceType(map, SIMD128_VALUE_TYPE);
+        __ j(equal, instr->TrueLabel(chunk_));
+      }
+
       if (expected & ToBooleanHint::kHeapNumber) {
         // heap number -> false iff +0, -0, or NaN.
         Label not_heap_number;
         __ CompareRoot(map, Heap::kHeapNumberMapRootIndex);
         __ j(not_equal, &not_heap_number, Label::kNear);
         XMMRegister xmm_scratch = double_scratch0();
         __ Xorpd(xmm_scratch, xmm_scratch);
         __ Ucomisd(xmm_scratch, FieldOperand(reg, HeapNumber::kValueOffset));
         __ j(zero, instr->FalseLabel(chunk_));
         __ jmp(instr->TrueLabel(chunk_));
@@ skipping 3104 matching lines @@
     __ CompareRoot(input, Heap::kNullValueRootIndex);
     __ j(equal, true_label, true_distance);
     STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
     __ CmpObjectType(input, FIRST_JS_RECEIVER_TYPE, input);
     __ j(below, false_label, false_distance);
     // Check for callable or undetectable objects => false.
     __ testb(FieldOperand(input, Map::kBitFieldOffset),
              Immediate((1 << Map::kIsCallable) | (1 << Map::kIsUndetectable)));
     final_branch_condition = zero;
 
+// clang-format off
+#define SIMD128_TYPE(TYPE, Type, type, lane_count, lane_type)       \
+  } else if (String::Equals(type_name, factory->type##_string())) { \
+    __ JumpIfSmi(input, false_label, false_distance);               \
+    __ CompareRoot(FieldOperand(input, HeapObject::kMapOffset),     \
+                   Heap::k##Type##MapRootIndex);                    \
+    final_branch_condition = equal;
+  SIMD128_TYPES(SIMD128_TYPE)
+#undef SIMD128_TYPE
+    // clang-format on
+
   } else {
     __ jmp(false_label, false_distance);
   }
 
   return final_branch_condition;
 }
 
 
 void LCodeGen::EnsureSpaceForLazyDeopt(int space_needed) {
   if (info()->ShouldEnsureSpaceForLazyDeopt()) {
@@ skipping 229 matching lines @@
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64