Fix wrong assumption in parser that parsing a function literal cannot throw an exception.

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 2217f23e58977fd47b4d730bcd3b51e768f132e2..74ee087e0f4b3b146a860fcfbe2f3622bd93b310 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -764,8 +764,6 @@ FunctionLiteral* Parser::ParseLazy(Handle<SharedFunctionInfo> info,
                                   RelocInfo::kNoPosition, type, &ok);
     // Make sure the results agree.
     ASSERT(ok == (result != NULL));
-    // The only errors should be stack overflows.
-    ASSERT(ok || stack_overflow_);
   }
 
   // Make sure the target stack is empty.
@@ -774,8 +772,8 @@ FunctionLiteral* Parser::ParseLazy(Handle<SharedFunctionInfo> info,
   // If there was a stack overflow we have to get rid of AST and it is
   // not safe to do before scope has been deleted.
   if (result == NULL) {
-    Top::StackOverflow();
     zone_scope->DeleteOnExit();
+    if (stack_overflow_) Top::StackOverflow();
   } else {
     Handle<String> inferred_name(info->inferred_name());
     result->set_inferred_name(inferred_name);