Fuse compare with branch at graph building time.

runtime/vm/il_printer.cc

Index: runtime/vm/il_printer.cc
===================================================================
--- runtime/vm/il_printer.cc	(revision 9728)
+++ runtime/vm/il_printer.cc	(working copy)
@@ -443,16 +443,16 @@
 void BranchInstr::PrintTo(BufferFormatter* f) const {
   f->Print("    %s ", DebugName());
   f->Print("if ");
-  if (is_fused_with_comparison()) {
-    if (is_negated()) f->Print(" not ");
-    fused_with_comparison_->PrintTo(f);
-  } else {
-    value()->PrintTo(f);
-  }
+  left()->PrintTo(f);
+  f-> Print(" %s ", Token::Str(kind()));
+  right()->PrintTo(f);
 
   f->Print(" goto (%d, %d)",
             true_successor()->block_id(),
             false_successor()->block_id());
+  if (HasICData()) {
+    PrintICData(f, *ic_data());
+  }
 }
 
 
@@ -694,7 +694,9 @@
 void BranchInstr::PrintToVisualizer(BufferFormatter* f) const {
   f->Print("_ %s ", DebugName());
   f->Print("if ");
-  value()->PrintTo(f);
+  left()->PrintTo(f);
+  f-> Print(" %s ", Token::Str(kind()));
+  right()->PrintTo(f);
   f->Print(" goto (B%d, B%d)",
             true_successor()->block_id(),
             false_successor()->block_id());