A couple of fixes for using Makefile.standalone on Mac.

src/IceTargetLoweringX8632.cpp

 //===- subzero/src/IceTargetLoweringX8632.cpp - x86-32 lowering -----------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the TargetLoweringX8632 class, which
@@ skipping 125 matching lines @@
   return BaseOS.str();
 }
 
 // In some cases, there are x-macros tables for both high-level and
 // low-level instructions/operands that use the same enum key value.
 // The tables are kept separate to maintain a proper separation
 // between abstraction layers.  There is a risk that the tables
 // could get out of sync if enum values are reordered or if entries
 // are added or deleted.  This dummy function uses static_assert to
 // ensure everything is kept in sync.
-void xMacroIntegrityCheck() {
+void __attribute__((unused)) xMacroIntegrityCheck() {
   // Validate the enum values in FCMPX8632_TABLE.
   {
     // Define a temporary set of enum values based on low-level
     // table entries.
     enum _tmp_enum {
 #define X(val, dflt, swapS, C1, C2, swapV, pred) _tmp_##val,
       FCMPX8632_TABLE
 #undef X
           _num
     };
@@ skipping 3860 matching lines @@
     for (SizeT i = 0; i < Size; ++i) {
       Str << "\t.byte\t" << (((unsigned)Data[i]) & 0xff) << "\n";
     }
     Str << "\t.size\t" << MangledName << ", " << Size << "\n";
   }
   Str << "\t" << (IsInternal ? ".local" : ".global") << "\t" << MangledName
       << "\n";
 }
 
 } // end of namespace Ice