implement the null function for the Mips32 subzero compiler

src/assembler_mips32.h

-//===- subzero/src/assembler_mips.h - Assembler for MIPS --------*- C++ -*-===//
-//
-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-//
-// Modified by the Subzero authors.
-//
-//===----------------------------------------------------------------------===//
-//
-//                        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 Assembler class for MIPS32.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef SUBZERO_SRC_ASSEMBLER_MIPS32_H
-#define SUBZERO_SRC_ASSEMBLER_MIPS32_H
-
-#include "IceAssembler.h"
-#include "IceDefs.h"
-#include "IceFixups.h"
-
-namespace Ice {
-namespace MIPS32 {
-
-class AssemblerMIPS32 : public Assembler {
-  AssemblerMIPS32(const AssemblerMIPS32 &) = delete;
-  AssemblerMIPS32 &operator=(const AssemblerMIPS32 &) = delete;
-
-public:
-  explicit AssemblerMIPS32(bool use_far_branches = false) : Assembler() {
-    // This mode is only needed and implemented for MIPS32 and ARM.
-    assert(!use_far_branches);
-    (void)use_far_branches;
-  }
-  ~AssemblerMIPS32() override = default;
-
-  void alignFunction() override {
-    llvm::report_fatal_error("Not yet implemented.");
-  }
-
-  SizeT getBundleAlignLog2Bytes() const override { return 4; }
-
-  const char *getNonExecPadDirective() const override { return ".TBD"; }
-
-  llvm::ArrayRef<uint8_t> getNonExecBundlePadding() const override {
-    llvm::report_fatal_error("Not yet implemented.");
-  }
-
-  void padWithNop(intptr_t Padding) override {
-    (void)Padding;
-    llvm::report_fatal_error("Not yet implemented.");
-  }
-
-  void bindCfgNodeLabel(SizeT NodeNumber) override {
-    (void)NodeNumber;
-    llvm::report_fatal_error("Not yet implemented.");
-  }
-
-  bool fixupIsPCRel(FixupKind Kind) const override {
-    (void)Kind;
-    llvm::report_fatal_error("Not yet implemented.");
-  }
-};
-
-} // end of namespace MIPS32
-} // end of namespace Ice
-
-#endif // SUBZERO_SRC_ASSEMBLER_MIPS32_H