Revert of [turbofan] remove control field from instruction

src/compiler/ia32/instruction-selector-ia32.cc

Index: src/compiler/ia32/instruction-selector-ia32.cc
diff --git a/src/compiler/ia32/instruction-selector-ia32.cc b/src/compiler/ia32/instruction-selector-ia32.cc
index 06ae73e0efd039c8a8d5386b842c2ca776dd1b6b..16063ab43b41c4b25e0618620a6f213b06985d42 100644
--- a/src/compiler/ia32/instruction-selector-ia32.cc
+++ b/src/compiler/ia32/instruction-selector-ia32.cc
@@ -374,8 +374,9 @@
   DCHECK_GE(arraysize(inputs), input_count);
   DCHECK_GE(arraysize(outputs), output_count);
 
-  selector->Emit(cont->Encode(opcode), output_count, outputs, input_count,
-                 inputs);
+  Instruction* instr = selector->Emit(cont->Encode(opcode), output_count,
+                                      outputs, input_count, inputs);
+  if (cont->IsBranch()) instr->MarkAsControl();
 }
 
 
@@ -775,7 +776,8 @@
   IA32OperandGenerator g(selector);
   if (cont->IsBranch()) {
     selector->Emit(cont->Encode(opcode), NULL, left, right,
-                   g.Label(cont->true_block()), g.Label(cont->false_block()));
+                   g.Label(cont->true_block()),
+                   g.Label(cont->false_block()))->MarkAsControl();
   } else {
     DCHECK(cont->IsSet());
     // TODO(titzer): Needs byte register.