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

src/crankshaft/s390/lithium-codegen-s390.cc

 // Copyright 2014 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/s390/lithium-codegen-s390.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 5172 matching lines @@
   __ ClampDoubleToUint8(result_reg, temp_reg, double_scratch0());
   __ b(&done, Label::kNear);
 
   // smi
   __ bind(&is_smi);
   __ ClampUint8(result_reg, result_reg);
 
   __ bind(&done);
 }
 
-void LCodeGen::DoDoubleBits(LDoubleBits* instr) {
-  DoubleRegister value_reg = ToDoubleRegister(instr->value());
-  Register result_reg = ToRegister(instr->result());
-  __ lgdr(result_reg, value_reg);
-  if (instr->hydrogen()->bits() == HDoubleBits::HIGH) {
-    __ srlg(result_reg, result_reg, Operand(32));
-  } else {
-    __ llgfr(result_reg, result_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 470 matching lines @@
   __ LoadP(result,
            FieldMemOperand(scratch, FixedArray::kHeaderSize - kPointerSize));
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8