Fuse comparisons that are used by branches together.

runtime/vm/flow_graph_compiler_ia32.h

Index: runtime/vm/flow_graph_compiler_ia32.h
diff --git a/runtime/vm/flow_graph_compiler_ia32.h b/runtime/vm/flow_graph_compiler_ia32.h
index ea4e0aa4b98aa7eb8ee8079194c408205087583e..2a7e533de15970991e8b24c764a38f7119b8e0e9 100644
--- a/runtime/vm/flow_graph_compiler_ia32.h
+++ b/runtime/vm/flow_graph_compiler_ia32.h
@@ -176,6 +176,9 @@ class FlowGraphCompiler : public ValueObject {
 
   static const int kLocalsOffsetFromFP = (-1 * kWordSize);
 
+  const Bool& bool_true() const { return bool_true_; }
+  const Bool& bool_false() const { return bool_false_; }
+
  private:
   friend class DeoptimizationStub;
 
@@ -263,6 +266,9 @@ class FlowGraphCompiler : public ValueObject {
   GrowableArray<DeoptimizationStub*> deopt_stubs_;
   const bool is_optimizing_;
 
+  const Bool& bool_true_;
+  const Bool& bool_false_;
+
   DISALLOW_COPY_AND_ASSIGN(FlowGraphCompiler);
 };