Add a basic TargetARM32 skeleton which knows nothing.

src/assembler_arm32.h

Index: src/assembler_arm32.h
diff --git a/src/assembler_arm32.h b/src/assembler_arm32.h
new file mode 100644
index 0000000000000000000000000000000000000000..5452d4af20265bcf3baf7e7a6c54531a23426eda
--- /dev/null
+++ b/src/assembler_arm32.h
@@ -0,0 +1,72 @@
+//===- subzero/src/assembler_arm32.h - Assembler for ARM32 ------*- 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 ARM32.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SUBZERO_SRC_ASSEMBLER_ARM32_H
+#define SUBZERO_SRC_ASSEMBLER_ARM32_H
+
+#include "IceDefs.h"
+#include "IceFixups.h"
+
+#include "assembler.h"
+
+namespace Ice {
+
+class AssemblerARM32 : public Assembler {
+  AssemblerARM32(const AssemblerARM32 &) = delete;
+  AssemblerARM32 &operator=(const AssemblerARM32 &) = delete;
+
+public:
+  explicit AssemblerARM32(bool use_far_branches = false) : Assembler() {
+    // This mode is only needed and implemented for MIPS and ARM.
+    assert(!use_far_branches);
+    (void)use_far_branches;
+  }
+  ~AssemblerARM32() override = default;
+
+  void alignFunction() override {
+    llvm::report_fatal_error("Not yet implemented.");
+  }
+
+  SizeT getBundleAlignLog2Bytes() const override { return 4; }
+
+  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 Ice
+
+#endif // SUBZERO_SRC_ASSEMBLER_ARM32_H