Subzero: Use a setcc sequence for better icmp lowering.

src/assembler_ia32.cpp

 //===- 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.
 //
 //===----------------------------------------------------------------------===//
 //
 //                        The Subzero Code Generator
@@ skipping 138 matching lines @@
   EmitUint8(0x61);
 }
 
 void AssemblerX8632::setcc(CondX86::BrCond condition, ByteRegister dst) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0x0F);
   EmitUint8(0x90 + condition);
   EmitUint8(0xC0 + dst);
 }
 
+// TODO(stichnot): Upstream to Dart.
+void AssemblerX8632::setcc(CondX86::BrCond condition, const Address &address) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x0F);
+  EmitUint8(0x90 + condition);
+  EmitOperand(0, address);
+}
+
 void AssemblerX8632::mov(Type Ty, GPRRegister dst, const Immediate &imm) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   if (isByteSizedType(Ty)) {
     EmitUint8(0xB0 + dst);
     EmitUint8(imm.value() & 0xFF);
     return;
   }
   if (Ty == IceType_i16)
     EmitOperandSizeOverride();
   EmitUint8(0xB8 + dst);
@@ skipping 2408 matching lines @@
   assert(shifter == RegX8632::Encoded_Reg_ecx);
   (void)shifter;
   if (Ty == IceType_i16)
     EmitOperandSizeOverride();
   EmitUint8(isByteSizedArithType(Ty) ? 0xD2 : 0xD3);
   EmitOperand(rm, operand);
 }
 
 } // end of namespace X8632
 } // end of namespace Ice