Rebased PNaCl localmods in LLVM to 223109

lib/Target/ARM/MCTargetDesc/ARMAsmBackendNaClELF.h

+//===-- ARMAsmBackendNaClELF.h  ARM Asm Backend NaCl ELF --------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_ARM_ARMASMBACKENDNACLELF_H
+#define LLVM_LIB_TARGET_ARM_ARMASMBACKENDNACLELF_H
+
+// This whole file is a @LOCALMOD
+#include "MCTargetDesc/ARMAsmBackendELF.h"
+#include "MCTargetDesc/ARMMCNaCl.h"
+
+using namespace llvm;
+
+namespace {
+class ARMAsmBackendNaClELF : public ARMAsmBackendELF {
+public:
+  ARMAsmBackendNaClELF(const Target &T, const StringRef TT, uint8_t _OSABI,
+                    bool isLittle)
+      : ARMAsmBackendELF(T, TT, _OSABI, isLittle),
+        STI(ARM_MC::createARMMCSubtargetInfo(TT, "", "")) {
+    assert(isLittle && "NaCl only supports little-endian");
+    State.SaveCount = 0;
+    State.I = 0;
+    State.RecursiveCall = false;
+  }
+
+  ~ARMAsmBackendNaClELF() override {}
+
+  bool CustomExpandInst(const MCInst &Inst, MCStreamer &Out) override {
+    return CustomExpandInstNaClARM(*STI, Inst, Out, State);
+  }
+
+private:
+  // TODO(jfb) When upstreaming this class we can drop STI since ARMAsmBackend
+  //           already has one. It's unfortunately private so we recreate one
+  //           here to avoid the extra localmod.
+  std::unique_ptr<MCSubtargetInfo> STI;
+  ARMMCNaClSFIState State;
+};
+} // end anonymous namespace
+
+#endif