Subzero: Do class definition cleanups for assembler files too.

src/assembler_ia32.cpp

Index: src/assembler_ia32.cpp
diff --git a/src/assembler_ia32.cpp b/src/assembler_ia32.cpp
index 9042cf1b4451c2742463b9de7708433a417a3acf..2b80820558ec3e2826b6d06270801750c136e031 100644
--- a/src/assembler_ia32.cpp
+++ b/src/assembler_ia32.cpp
@@ -1,10 +1,11 @@
+//===- subzero/src/assembler_ia32.cpp - Assembler for x86-32  -------------===//
 // 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.
 //
-//===- subzero/src/assembler_ia32.cpp - Assembler for x86-32  -------------===//
+//===----------------------------------------------------------------------===//
 //
 //                        The Subzero Code Generator
 //
@@ -26,6 +27,9 @@ namespace Ice {
 namespace x86 {
 
 class DirectCallRelocation : public AssemblerFixup {
+  DirectCallRelocation(const DirectCallRelocation &) = delete;
+  DirectCallRelocation &operator=(const DirectCallRelocation &) = delete;
+
 public:
   static DirectCallRelocation *create(Assembler *Asm, FixupKind Kind,
                                       const ConstantRelocatable *Sym) {
@@ -2320,6 +2324,11 @@ void AssemblerX86::xchg(Type Ty, const Address &addr, GPRRegister reg) {
   EmitOperand(reg, addr);
 }
 
+void AssemblerX86::EmitSegmentOverride(uint8_t prefix) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(prefix);
+}
+
 void AssemblerX86::Align(intptr_t alignment, intptr_t offset) {
   assert(llvm::isPowerOf2_32(alignment));
   intptr_t pos = offset + buffer_.GetPosition();