VM: Make optimized try-catch work in DBC.

runtime/vm/flow_graph_compiler_dbc.cc

Index: runtime/vm/flow_graph_compiler_dbc.cc
diff --git a/runtime/vm/flow_graph_compiler_dbc.cc b/runtime/vm/flow_graph_compiler_dbc.cc
index 2b1763eaa1e370191cd0070c6fb8bcef9ad73c13..9f0aee9d0c7830be6eaada6076e2a4632c8f5983 100644
--- a/runtime/vm/flow_graph_compiler_dbc.cc
+++ b/runtime/vm/flow_graph_compiler_dbc.cc
@@ -194,10 +194,12 @@ void FlowGraphCompiler::RecordAfterCall(Instruction* instr) {
     // hence the difference.
     pending_deoptimization_env_->DropArguments(instr->ArgumentCount());
     AddDeoptIndexAtCall(deopt_id_after);
+    // This descriptor is needed for exception handling in optimized code.
+    AddCurrentDescriptor(RawPcDescriptors::kOther,
+                         deopt_id_after, instr->token_pos());
   } else {
     // Add deoptimization continuation point after the call and before the
     // arguments are removed.
-    // In optimized code this descriptor is needed for exception handling.
     AddCurrentDescriptor(RawPcDescriptors::kDeopt,
                          deopt_id_after,
                          instr->token_pos());