Fuse comparisons that are used by branches together.

runtime/vm/flow_graph_compiler_ia32.cc

Index: runtime/vm/flow_graph_compiler_ia32.cc
diff --git a/runtime/vm/flow_graph_compiler_ia32.cc b/runtime/vm/flow_graph_compiler_ia32.cc
index e87dfd03e0744a92a99646ace4f5939569c3687b..659a744ddb1b5e4435068d81f66ca5982496bcef 100644
--- a/runtime/vm/flow_graph_compiler_ia32.cc
+++ b/runtime/vm/flow_graph_compiler_ia32.cc
@@ -408,8 +408,7 @@ void FlowGraphCompiler::GenerateBoolToJump(Register bool_register,
   Label fall_through;
   __ cmpl(bool_register, raw_null);
   __ j(EQUAL, &fall_through, Assembler::kNearJump);
-  const Bool& bool_true = Bool::ZoneHandle(Bool::True());
-  __ CompareObject(bool_register, bool_true);
+  __ CompareObject(bool_register, true_value());
   __ j(EQUAL, is_true);
   __ jmp(is_false);
   __ Bind(&fall_through);
@@ -790,8 +789,6 @@ void FlowGraphCompiler::GenerateInstanceOf(intptr_t cid,
                                           const AbstractType& type,
                                           bool negate_result) {
   ASSERT(type.IsFinalized() && !type.IsMalformed());
-  const Bool& bool_true = Bool::ZoneHandle(Bool::True());
-  const Bool& bool_false = Bool::ZoneHandle(Bool::False());
 
   const Immediate raw_null =
       Immediate(reinterpret_cast<intptr_t>(Object::null()));
@@ -836,21 +833,21 @@ void FlowGraphCompiler::GenerateInstanceOf(intptr_t cid,
   Label done;
   if (negate_result) {
     __ popl(EDX);
-    __ LoadObject(EAX, bool_true);
+    __ LoadObject(EAX, true_value());
     __ cmpl(EDX, EAX);
     __ j(NOT_EQUAL, &done, Assembler::kNearJump);
-    __ LoadObject(EAX, bool_false);
+    __ LoadObject(EAX, false_value());
   } else {
     __ popl(EAX);
   }
   __ jmp(&done, Assembler::kNearJump);
 
   __ Bind(&is_not_instance);
-  __ LoadObject(EAX, negate_result ? bool_true : bool_false);
+  __ LoadObject(EAX, negate_result ? true_value() : false_value());
   __ jmp(&done, Assembler::kNearJump);
 
   __ Bind(&is_instance);
-  __ LoadObject(EAX, negate_result ? bool_false : bool_true);
+  __ LoadObject(EAX, negate_result ? false_value() : true_value());
   __ Bind(&done);
   __ popl(EDX);  // Remove pushed instantiator type arguments.
   __ popl(ECX);  // Remove pushed instantiator.