Revert of Remove SIMD.js from V8.

src/crankshaft/mips64/lithium-codegen-mips64.cc

 // Copyright 2012 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/mips64/lithium-codegen-mips64.h"
 
 #include "src/builtins/builtins-constructor.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/crankshaft/hydrogen-osr.h"
@@ skipping 2128 matching lines @@
         __ bind(&not_string);
       }
 
       if (expected & ToBooleanHint::kSymbol) {
         // Symbol value -> true.
         const Register scratch = scratch1();
         __ lbu(scratch, FieldMemOperand(map, Map::kInstanceTypeOffset));
         __ Branch(instr->TrueLabel(chunk_), eq, scratch, Operand(SYMBOL_TYPE));
       }
 
+      if (expected & ToBooleanHint::kSimdValue) {
+        // SIMD value -> true.
+        const Register scratch = scratch1();
+        __ lbu(scratch, FieldMemOperand(map, Map::kInstanceTypeOffset));
+        __ Branch(instr->TrueLabel(chunk_), eq, scratch,
+                  Operand(SIMD128_VALUE_TYPE));
+      }
+
       if (expected & ToBooleanHint::kHeapNumber) {
         // heap number -> false iff +0, -0, or NaN.
         DoubleRegister dbl_scratch = double_scratch0();
         Label not_heap_number;
         __ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
         __ Branch(&not_heap_number, ne, map, Operand(at));
         __ ldc1(dbl_scratch, FieldMemOperand(reg, HeapNumber::kValueOffset));
         __ BranchF(instr->TrueLabel(chunk_), instr->FalseLabel(chunk_),
                    ne, dbl_scratch, kDoubleRegZero);
         // Falls through if dbl_scratch == 0.
@@ skipping 3189 matching lines @@
     __ GetObjectType(input, scratch, scratch1());
     __ Branch(false_label, lt, scratch1(), Operand(FIRST_JS_RECEIVER_TYPE));
     // Check for callable or undetectable objects => false.
     __ lbu(scratch, FieldMemOperand(scratch, Map::kBitFieldOffset));
     __ And(at, scratch,
            Operand((1 << Map::kIsCallable) | (1 << Map::kIsUndetectable)));
     *cmp1 = at;
     *cmp2 = Operand(zero_reg);
     final_branch_condition = eq;
 
+// 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);                                \
+    __ ld(input, FieldMemOperand(input, HeapObject::kMapOffset));    \
+    __ LoadRoot(at, Heap::k##Type##MapRootIndex);                    \
+    *cmp1 = input;                                                   \
+    *cmp2 = Operand(at);                                             \
+    final_branch_condition = eq;
+  SIMD128_TYPES(SIMD128_TYPE)
+#undef SIMD128_TYPE
+    // clang-format on
+
+
   } else {
     *cmp1 = at;
     *cmp2 = Operand(zero_reg);  // Set to valid regs, to avoid caller assertion.
     __ Branch(false_label);
   }
 
   return final_branch_condition;
 }
 
 
@@ skipping 240 matching lines @@
   __ ld(result, FieldMemOperand(scratch,
                                 FixedArray::kHeaderSize - kPointerSize));
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8