Allow smi comparisons to have constant operands.

runtime/vm/intermediate_language.cc

Index: runtime/vm/intermediate_language.cc
diff --git a/runtime/vm/intermediate_language.cc b/runtime/vm/intermediate_language.cc
index b04179de7da4a494fa7b8627eefeb348141ce156..d57c3b4a1cdd381a7d0c8757fc5d8a5bab32d879 100644
--- a/runtime/vm/intermediate_language.cc
+++ b/runtime/vm/intermediate_language.cc
@@ -1306,6 +1306,16 @@ static Condition NegateCondition(Condition condition) {
 }
 
 
+void ControlInstruction::EmitBranchOnValue(FlowGraphCompiler* compiler,
+                                           bool value) {
+  if (value && compiler->IsNextBlock(false_successor())) {
+    __ jmp(compiler->GetBlockLabel(true_successor()));
+  } else if (!value && compiler->IsNextBlock(true_successor())) {
+    __ jmp(compiler->GetBlockLabel(false_successor()));
+  }
+}
+
+
 void ControlInstruction::EmitBranchOnCondition(FlowGraphCompiler* compiler,
                                                Condition true_condition) {
   if (compiler->IsNextBlock(false_successor())) {