[builtins] Introduce proper Float64Tan operator.

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/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 2200 matching lines @@
   Register result_reg = ToRegister(instr->result());
   if (instr->hydrogen()->bits() == HDoubleBits::HIGH) {
     __ Fmov(result_reg, value_reg);
     __ Lsr(result_reg, result_reg, 32);
   } else {
     __ Fmov(result_reg.W(), value_reg.S());
   }
 }
 
 
-void LCodeGen::DoConstructDouble(LConstructDouble* instr) {
-  Register hi_reg = ToRegister(instr->hi());
-  Register lo_reg = ToRegister(instr->lo());
-  DoubleRegister result_reg = ToDoubleRegister(instr->result());
-
-  // Insert the least significant 32 bits of hi_reg into the most significant
-  // 32 bits of lo_reg, and move to a floating point register.
-  __ Bfi(lo_reg, hi_reg, 32, 32);
-  __ Fmov(result_reg, lo_reg);
-}
-
-
 void LCodeGen::DoClassOfTestAndBranch(LClassOfTestAndBranch* instr) {
   Handle<String> class_name = instr->hydrogen()->class_name();
   Label* true_label = instr->TrueLabel(chunk_);
   Label* false_label = instr->FalseLabel(chunk_);
   Register input = ToRegister(instr->value());
   Register scratch1 = ToRegister(instr->temp1());
   Register scratch2 = ToRegister(instr->temp2());
 
   __ JumpIfSmi(input, false_label);
 
@@ skipping 3502 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