[interpreter] Implement handling of try-finally constructs.

src/interpreter/control-flow-builders.cc

Index: src/interpreter/control-flow-builders.cc
diff --git a/src/interpreter/control-flow-builders.cc b/src/interpreter/control-flow-builders.cc
index b50360c8e713265ef8edab44f6c8cb66c7c1ba8b..c30fc6d0f676f3cb4b48aa52e94c8bdb16a90101 100644
--- a/src/interpreter/control-flow-builders.cc
+++ b/src/interpreter/control-flow-builders.cc
@@ -159,13 +159,31 @@ void TryFinallyBuilder::BeginTry(Register context) {
 }
 
 
+void TryFinallyBuilder::LeaveTry() {
+  finalization_sites_.push_back(BytecodeLabel());
+  builder()->Jump(&finalization_sites_.back());
+}
+
+
 void TryFinallyBuilder::EndTry() {
   builder()->MarkTryEnd(handler_id_);
+}
+
+
+void TryFinallyBuilder::BeginHandler() {
   builder()->Bind(&handler_);
   builder()->MarkHandler(handler_id_, false);
 }
 
 
+void TryFinallyBuilder::BeginFinally() {
+  for (size_t i = 0; i < finalization_sites_.size(); i++) {
+    BytecodeLabel& site = finalization_sites_.at(i);
+    builder()->Bind(&site);
+  }
+}
+
+
 void TryFinallyBuilder::EndFinally() {
   // Nothing to be done here.
 }