[Turbofan] Revert FP register aliasing support on Arm.

src/compiler/instruction.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/compiler/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/instruction.h"
 #include "src/compiler/schedule.h"
 #include "src/compiler/state-values-utils.h"
 
@@ skipping 47 matching lines @@
     case kNotOverflow:
     case kUnorderedEqual:
     case kUnorderedNotEqual:
       return condition;
   }
   UNREACHABLE();
   return condition;
 }
 
 bool InstructionOperand::InterferesWith(const InstructionOperand& that) const {
-  if (!IsFPRegister() || !that.IsFPRegister() || kSimpleFPAliasing)
-    return EqualsCanonicalized(that);
-  // Both operands are fp registers and aliasing is non-simple.
-  const LocationOperand& loc1 = *LocationOperand::cast(this);
-  const LocationOperand& loc2 = LocationOperand::cast(that);
-  return GetRegConfig()->AreAliases(loc1.representation(), loc1.register_code(),
-                                    loc2.representation(),
-                                    loc2.register_code());
+  return EqualsCanonicalized(that);
 }
 
 void InstructionOperand::Print(const RegisterConfiguration* config) const {
   OFStream os(stdout);
   PrintableInstructionOperand wrapper;
   wrapper.register_configuration_ = config;
   wrapper.op_ = *this;
   os << wrapper << std::endl;
 }
 
@@ skipping 935 matching lines @@
   }
   for (int i = 0; i < code.InstructionBlockCount(); i++) {
     printable.sequence_->PrintBlock(printable.register_configuration_, i);
   }
   return os;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8