Create fewer local v8::TryCatch objects in generated bindings code

Source/bindings/scripts/v8_interface.py

Index: Source/bindings/scripts/v8_interface.py
diff --git a/Source/bindings/scripts/v8_interface.py b/Source/bindings/scripts/v8_interface.py
index fe2fda5b2f5fe0e46cfbfec58757501bfd3f56f8..73498435a679bae64fb6e698e69b42e350d8b1e8 100644
--- a/Source/bindings/scripts/v8_interface.py
+++ b/Source/bindings/scripts/v8_interface.py
@@ -472,10 +472,15 @@ def Counter(iterable):
 
 # [Constructor]
 def generate_constructor(interface, constructor):
+    generated_arguments = [v8_methods.generate_argument(interface, constructor, argument, index)
+                           for index, argument in enumerate(constructor.arguments)]
+
     return {
         'argument_list': constructor_argument_list(interface, constructor),
-        'arguments': [v8_methods.generate_argument(interface, constructor, argument, index)
-                      for index, argument in enumerate(constructor.arguments)],
+        'arguments': generated_arguments,
+        'arguments_need_try_catch': any(
+            v8_methods.argument_needs_try_catch(argument)
+            for argument in generated_arguments),
         'cpp_type': cpp_template_type(
             cpp_ptr_type('RefPtr', 'RawPtr', gc_type(interface)),
             cpp_name(interface)),