arrange to create prototypes for generators

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index 09012b6f9bcb981c9a63ca54c5d24111a79bd475..cd170e069f2a53786ec01909a2b9d039f8b30985 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -163,9 +163,13 @@ void FastNewClosureStub::Generate(MacroAssembler* masm) {
   // Get the function info from the stack.
   __ mov(edx, Operand(esp, 1 * kPointerSize));
 
-  int map_index = (language_mode_ == CLASSIC_MODE)
-      ? Context::FUNCTION_MAP_INDEX
-      : Context::STRICT_MODE_FUNCTION_MAP_INDEX;
+  int map_index = is_generator_
+      ? ((language_mode_ == CLASSIC_MODE)
+         ? Context::GENERATOR_FUNCTION_MAP_INDEX
+         : Context::STRICT_MODE_GENERATOR_FUNCTION_MAP_INDEX)
+      : ((language_mode_ == CLASSIC_MODE)
+         ? Context::FUNCTION_MAP_INDEX
+         : Context::STRICT_MODE_FUNCTION_MAP_INDEX);
 
   // Compute the function map in the current native context and set that
   // as the map of the allocated object.