Optimize functions containing try-catch.

runtime/vm/il_printer.cc

Index: runtime/vm/il_printer.cc
===================================================================
--- runtime/vm/il_printer.cc	(revision 22613)
+++ runtime/vm/il_printer.cc	(working copy)
@@ -824,6 +824,17 @@
     f->Print(" ");
     parallel_move()->PrintTo(f);
   }
+
+  const GrowableArray<Definition*>& defns = initial_definitions_;
+  if (defns.length() > 0) {
+    f->Print(" {");
+    for (intptr_t i = 0; i < defns.length(); ++i) {
+      Definition* def = defns[i];
+      f->Print("\n      ");
+      def->PrintTo(f);
+    }
+    f->Print("\n}");
+  }
 }