[intrinsics] Drop the now obsolete %_DoubleHi and %_DoubleLo intrinsics.

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 2184 matching lines @@
   __ Bind(&is_heap_number);
   DoubleRegister dbl_scratch = double_scratch();
   DoubleRegister dbl_scratch2 = ToDoubleRegister(instr->temp1());
   __ Ldr(dbl_scratch, FieldMemOperand(input, HeapNumber::kValueOffset));
   __ ClampDoubleToUint8(result, dbl_scratch, dbl_scratch2);
 
   __ Bind(&done);
 }
 
 
-void LCodeGen::DoDoubleBits(LDoubleBits* instr) {
-  DoubleRegister value_reg = ToDoubleRegister(instr->value());
-  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::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