Fast-codegen: Implementing try/finally on top of nesting context.

src/fast-codegen.h

Index: src/fast-codegen.h
diff --git a/src/fast-codegen.h b/src/fast-codegen.h
index 5fa89c4759a80b17c1cd634fd5d598745ba96a2b..c83a520f72096ab561d76ed5d7b21ee91778238f 100644
--- a/src/fast-codegen.h
+++ b/src/fast-codegen.h
@@ -266,6 +266,12 @@ class FastCodeGenerator: public AstVisitor {
   void SetStatementPosition(Statement* stmt);
   void SetSourcePosition(int pos);
 
+  // Non-local control flow support.
+  void EnterFinallyBlock();
+  void ReturnFromFinallyBlock();
+  void ThrowException();
+
+  // Loop nesting counter.
   int loop_depth() { return loop_depth_; }
   void increment_loop_depth() { loop_depth_++; }
   void decrement_loop_depth() {