[builtins] Introduce proper Float64Tan operator.

src/crankshaft/arm/lithium-codegen-arm.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/arm/lithium-codegen-arm.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/crankshaft/arm/lithium-gap-resolver-arm.h"
@@ skipping 5028 matching lines @@
   DwVfpRegister value_reg = ToDoubleRegister(instr->value());
   Register result_reg = ToRegister(instr->result());
   if (instr->hydrogen()->bits() == HDoubleBits::HIGH) {
     __ VmovHigh(result_reg, value_reg);
   } else {
     __ VmovLow(result_reg, value_reg);
   }
 }
 
 
-void LCodeGen::DoConstructDouble(LConstructDouble* instr) {
-  Register hi_reg = ToRegister(instr->hi());
-  Register lo_reg = ToRegister(instr->lo());
-  DwVfpRegister result_reg = ToDoubleRegister(instr->result());
-  __ VmovHigh(result_reg, hi_reg);
-  __ VmovLow(result_reg, lo_reg);
-}
-
-
 void LCodeGen::DoAllocate(LAllocate* instr) {
   class DeferredAllocate final : public LDeferredCode {
    public:
     DeferredAllocate(LCodeGen* codegen, LAllocate* instr)
         : LDeferredCode(codegen), instr_(instr) { }
     void Generate() override { codegen()->DoDeferredAllocate(instr_); }
     LInstruction* instr() override { return instr_; }
 
    private:
     LAllocate* instr_;
@@ skipping 489 matching lines @@
   __ ldr(result, FieldMemOperand(scratch,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8