Revert of [turbofan] Various fixes to allow unboxed doubles as arguments in registers...

src/compiler/machine-type.h

 // 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.
 
 #ifndef V8_COMPILER_MACHINE_TYPE_H_
 #define V8_COMPILER_MACHINE_TYPE_H_
 
 #include <iosfwd>
 
 #include "src/base/bits.h"
@@ skipping 98 matching lines @@
   return -1;
 }
 
 // Gets the element size in bytes of the machine type.
 inline int ElementSizeOf(MachineType machine_type) {
   const int shift = ElementSizeLog2Of(machine_type);
   DCHECK_NE(-1, shift);
   return 1 << shift;
 }
 
-inline bool IsFloatingPoint(MachineType type) {
-  MachineType rep = RepresentationOf(type);
-  return rep == kRepFloat32 || rep == kRepFloat64;
-}
-
 typedef Signature<MachineType> MachineSignature;
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MACHINE_TYPE_H_