Rebased PNaCl localmods in LLVM to 223109

include/llvm/MC/MCAsmBackend.h

 //===-- llvm/MC/MCAsmBackend.h - MC Asm Backend -----------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_MC_MCASMBACKEND_H
 #define LLVM_MC_MCASMBACKEND_H
 
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/MC/MCDirectives.h"
 #include "llvm/MC/MCDwarf.h"
 #include "llvm/MC/MCFixup.h"
 #include "llvm/Support/DataTypes.h"
 #include "llvm/Support/ErrorHandling.h"
 
 namespace llvm {
 class MCAsmLayout;
 class MCAssembler;
 class MCELFObjectTargetWriter;
 struct MCFixupKindInfo;
 class MCFragment;
 class MCInst;
 class MCRelaxableFragment;
 class MCObjectWriter;
 class MCSection;
+class MCStreamer;
 class MCValue;
 class raw_ostream;
 
 /// MCAsmBackend - Generic interface to target specific assembler backends.
 class MCAsmBackend {
   MCAsmBackend(const MCAsmBackend &) LLVM_DELETED_FUNCTION;
   void operator=(const MCAsmBackend &) LLVM_DELETED_FUNCTION;
 
 protected: // Can only create subclasses.
   MCAsmBackend();
@@ skipping 102 matching lines @@
 
   /// handleAssemblerFlag - Handle any target-specific assembler flags.
   /// By default, do nothing.
   virtual void handleAssemblerFlag(MCAssemblerFlag Flag) {}
 
   /// \brief Generate the compact unwind encoding for the CFI instructions.
   virtual uint32_t
       generateCompactUnwindEncoding(ArrayRef<MCCFIInstruction>) const {
     return 0;
   }
+  
+  // @LOCALMOD-BEGIN
+  /// CustomExpandInst -
+  ///   If the MCInst instruction has a custom expansion, write it to the
+  /// MCStreamer 'Out'. This can be used to perform "last minute" rewrites of
+  /// MCInst instructions for emission.
+  virtual bool CustomExpandInst(const MCInst &Inst, MCStreamer &Out) {
+    return false;
+  }
+  // @LOCALMOD-END
 };
 
 } // End llvm namespace
 
 #endif