Revert 20348 - "Fix LoadFieldByIndex to take mutable heap-numbers into account."

src/arm64/lithium-codegen-arm64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 131 matching lines @@
                             LOperand* value,
                             LOperand* temp1,
                             LOperand* temp2);
   void DoDeferredTaggedToI(LTaggedToI* instr,
                            LOperand* value,
                            LOperand* temp1,
                            LOperand* temp2);
   void DoDeferredAllocate(LAllocate* instr);
   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr);
   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
-  void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
-                                   Register result,
-                                   Register object,
-                                   Register index);
 
   Operand ToOperand32(LOperand* op, IntegerSignedness signedness);
 
   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
   void EmitGoto(int block);
   void DoGap(LGap* instr);
 
   // Generic version of EmitBranch. It contains some code to avoid emitting a
   // branch on the next emitted basic block where we could just fall-through.
   // You shouldn't use that directly but rather consider one of the helper like
@@ skipping 319 matching lines @@
 
  protected:
   MacroAssembler* masm() const { return codegen_->masm(); }
 
   LCodeGen* codegen_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM64_LITHIUM_CODEGEN_ARM64_H_