Subzero: Remove unneeded ScratchRegs.

src/IceTargetLoweringX8664.cpp

 //===- subzero/src/IceTargetLoweringX8664.cpp - x86-64 lowering -----------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 93 matching lines @@
 template <>
 std::array<llvm::SmallBitVector, RCX86_NUM>
     TargetX86Base<X8664::Traits>::TypeToRegisterSet = {{}};
 
 template <>
 std::array<llvm::SmallBitVector,
            TargetX86Base<X8664::Traits>::Traits::RegisterSet::Reg_NUM>
     TargetX86Base<X8664::Traits>::RegisterAliases = {{}};
 
 template <>
-llvm::SmallBitVector
-    TargetX86Base<X8664::Traits>::ScratchRegs = llvm::SmallBitVector();
-
-template <>
 FixupKind TargetX86Base<X8664::Traits>::PcRelFixup =
     TargetX86Base<X8664::Traits>::Traits::FK_PcRel;
 
 template <>
 FixupKind TargetX86Base<X8664::Traits>::AbsFixup =
     TargetX86Base<X8664::Traits>::Traits::FK_Abs;
 
 //------------------------------------------------------------------------------
 //     __      ______  __     __  ______  ______  __  __   __  ______
 //    /\ \    /\  __ \/\ \  _ \ \/\  ___\/\  == \/\ \/\ "-.\ \/\  ___\
@@ skipping 1292 matching lines @@
 #define X(tag, sizeLog2, align, elts, elty, str)                               \
   static_assert(_table1_##tag == _table2_##tag,                                \
                 "Inconsistency between ICETYPEX8664_TABLE and ICETYPE_TABLE");
 ICETYPE_TABLE
 #undef X
 } // end of namespace dummy3
 } // end of anonymous namespace
 
 } // end of namespace X8664
 } // end of namespace Ice