Stop attaching try_index to individual instructions put it at block entry instead.

runtime/vm/il_printer.cc

Index: runtime/vm/il_printer.cc
diff --git a/runtime/vm/il_printer.cc b/runtime/vm/il_printer.cc
index 30afbd1bd33e03986d7c78cfba352625bcddac12..02dbcbeeedb4b03312e13d99ecbd0e41ed36dd9b 100644
--- a/runtime/vm/il_printer.cc
+++ b/runtime/vm/il_printer.cc
@@ -498,8 +498,8 @@ void ParameterInstr::PrintTo(BufferFormatter* f) const {
 
 void TargetEntryInstr::PrintTo(BufferFormatter* f) const {
   f->Print("%2d: [target", block_id());
-  if (HasTryIndex()) {
-    f->Print(" catch %d]", try_index());
+  if (IsCatchEntry()) {
+    f->Print(" catch %d]", catch_try_index());
   } else {
     f->Print("]");
   }
@@ -763,8 +763,8 @@ void ParameterInstr::PrintToVisualizer(BufferFormatter* f) const {
 
 void TargetEntryInstr::PrintToVisualizer(BufferFormatter* f) const {
   f->Print("_ [target");
-  if (HasTryIndex()) {
-    f->Print(" catch %d]", try_index());
+  if (IsCatchEntry()) {
+    f->Print(" catch %d]", catch_try_index());
   } else {
     f->Print("]");
   }