LLVM: Add ELF Note section to NaCl object files identifying them as such to gold

tools/llvm-mc/llvm-mc.cpp

 //===-- llvm-mc.cpp - Machine Code Hacking Driver -------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This utility is a simple driver that allows command line hacking on machine
 // code.
 //
 //===----------------------------------------------------------------------===//
 
 #include "Disassembler.h"
 #include "llvm/ADT/OwningPtr.h"
 #include "llvm/MC/MCAsmBackend.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCCodeEmitter.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCInstPrinter.h"
 #include "llvm/MC/MCInstrInfo.h"
+#include "llvm/MC/MCNaCl.h"
 #include "llvm/MC/MCObjectFileInfo.h"
 #include "llvm/MC/MCParser/AsmLexer.h"
 #include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/MC/MCSectionMachO.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/MC/MCTargetAsmParser.h"
 #include "llvm/MC/SubtargetFeature.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileUtilities.h"
@@ skipping 413 matching lines @@
 
   } else if (FileType == OFT_Null) {
     Str.reset(createNullStreamer(Ctx));
   } else {
     assert(FileType == OFT_ObjectFile && "Invalid file type!");
     MCCodeEmitter *CE = TheTarget->createMCCodeEmitter(*MCII, *MRI, *STI, Ctx);
     MCAsmBackend *MAB = TheTarget->createMCAsmBackend(TripleName, MCPU);
     Str.reset(TheTarget->createMCObjectStreamer(TripleName, Ctx, *MAB,
                                                 FOS, CE, RelaxAll,
                                                 NoExecStack));
+    // @LOCALMOD-BEGIN
+    Triple T(TripleName);
+    if (T.isOSNaCl())
+      initializeNaClMCStreamer(*Str.get(), Ctx, T);
+    // @LOCALMOD-END
   }
 
   int Res = 1;
   bool disassemble = false;
   switch (Action) {
   case AC_AsLex:
     Res = AsLexInput(SrcMgr, *MAI, Out.get());
     break;
   case AC_Assemble:
     Res = AssembleInput(ProgName, TheTarget, SrcMgr, Ctx, *Str, *MAI, *STI);
@@ skipping 13 matching lines @@
     break;
   }
   if (disassemble)
     Res = Disassembler::disassemble(*TheTarget, TripleName, *STI, *Str,
                                     *Buffer, SrcMgr, Out->os());
 
   // Keep output if no errors.
   if (Res == 0) Out->keep();
   return Res;
 }